Notification method and apparatus for channel quality indicator and modulation and coding scheme

ABSTRACT

A notification method for a CQI and a modulation and coding scheme is provided. The method includes: learning, by a terminal, a first CQI index according to a first CQI table; sending the first CQI index to a base station; receiving, by the base station, the first CQI index sent by the terminal UE; determining a first MCS index according to the first CQI table, a first MCS table, and the received first CQI index; sending the determined first MCS index to the UE; receiving, by the terminal, the first MCS index sent by the base station; and determining a modulation order and a code block size according to the first MCS table and the received first MCS index; where the first CQI table includes entries in which modulation schemes are higher than 64QAM.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/837,890, filed on Dec. 11, 2017, which is a continuation of U.S.patent application Ser. No. 14/961,569, filed on Dec. 7, 2015, now U.S.Pat. No. 10,079,654, which is a continuation of InternationalApplication No. PCT/CN2013/084346, filed on Sep. 26, 2013. TheInternational Application claims priority to International PatentApplication No. PCT/CN2013/077023, filed on Jun. 8, 2013. All of theafore-mentioned patent applications are hereby incorporated by referencein their entireties.

TECHNICAL FIELD

Embodiments of the present invention relate to the field ofcommunications, and in particular, to a notification method andapparatus for a channel quality indicator and a modulation and codingscheme.

BACKGROUND

Currently, in a Long Term Evolution (LTE) system, an adaptive procedurefor a physical downlink shared channel (PDSCH,) is as follows: Userequipment (UE) estimates channel information used for measuring channelstate information (CSI); the UE calculates a signal to interference plusnoise ratio (SINR) by using the channel information and based on anoptimal rank indication (RI) and/or a precoding matrix indication (PMI);and the UE obtains a corresponding channel quality indicator (CQI)according to the SINR, and reports a CQI value to a base station. Thebase station allocates a modulation and coding scheme (MCS) to the UEaccording to the CQI value reported by the UE and a network condition,where the MCS is used for indicating a modulation scheme and a codingscheme that are currently used by the PDSCH.

In a hotspot scenario, for example, in a relay scenario or an LTEhotspot improvements (LTE-Hi) scenario, UE requires a modulation schemehigher than 64 quadrature amplitude modulation (QAM). However, due to alimitation in the prior art, a maximum CQI value is 15, and a modulationscheme corresponding to the CQI value is 64QAM; as a result, the UEcannot select a modulation scheme higher than 64QAM, thereby affectingsystem performance. Similarly, a base station cannot allocate amodulation scheme higher than 64QAM to the UE.

SUMMARY

Embodiments of the present invention provide a notification method andapparatus for a channel quality indicator and a modulation and codingscheme, so as to support UE and a base station to select a modulationscheme higher than 64QAM, thereby improving system performance.

To achieve the foregoing objective, the following technical solutionsare used in the embodiments of the present invention:

According to a first aspect, a notification method for a CQI isprovided, including:

learning a first CQI index according to an acquired first CQI table; and

sending the first CQI index to a base station, so that the base stationdetermines a first modulation and coding scheme MCS index according tothe first CQI index;

where the first CQI table includes:

entries in which modulation schemes are higher than 64 quadratureamplitude modulation QAM; and

at least one entry in which a modulation scheme is quadrature phaseshift keying QPSK in a second CQI table, where the at least one entry inwhich the modulation scheme is QPSK includes a combination except afirst combination of combinations formed by the at least one entry inwhich the modulation scheme is QPSK in the second CQI table, and thefirst combination is N entries with consecutive maximum CQI indicescorresponding to QPSK in the second CQI table, where N is equal to 3 orN is a positive integer less than 4 or N is a positive integer; and/orat least one entry in which a modulation scheme is 16QAM in the secondCQI table, where

modulation schemes in entries in the second CQI table include only QPSK,16QAM, and 64QAM.

With reference to the first aspect, in a first possible implementationmanner, the at least one entry in which the modulation scheme is QPSK inthe second CQI table includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

With reference to the first aspect, in a second possible implementationmanner, the at least one entry in which the modulation scheme is 16QAMin the second CQI table includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

With reference to the first aspect or the first two possibleimplementation manners, in a third possible implementation manner, thefirst CQI table further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

With reference to the third possible implementation manner, in a fourthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

With reference to the first aspect, in a fifth possible implementationmanner, a spectrum efficiency in an entry that is corresponding to aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table is equal to a spectrumefficiency in an entry that is corresponding to a maximum CQI index andof all entries in which modulation schemes are 64QAM in the second CQItable.

With reference to the first aspect, in a sixth possible implementationmanner, spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency, where: that spectrumefficiencies in X entries that are corresponding to maximum CQI indicesand of the entries in which the modulation schemes are higher than 64QAMare arranged in an arithmetic progression in ascending order of spectrumefficiency indicates that, in ascending order of spectrum efficiency andstarting from a second entry of the X entries, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is equal to a same constant; and thatspectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM are arranged approximately in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the Xentries, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is within a rangefrom a constant minus a preset value to the constant plus the presetvalue, where X is an integer greater than 2.

With reference to the first aspect, in a seventh possible implementationmanner, the entries in which the modulation schemes are higher than64QAM in the first CQI table include: at least three entries in whichmodulation schemes are 256QAM, where spectrum efficiencies in the atleast three entries in which the modulation schemes are 256QAM arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency, where: thatspectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionin ascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are 256QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are 256QAM are arranged approximately in anarithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value.

With reference to the first aspect, in an eighth possible implementationmanner, the first CQI table includes: at least three entries in whichmodulation schemes are higher than 64QAM, where spectrum efficiencies inthe at least three entries in which the modulation schemes are higherthan 64QAM are arranged in an arithmetic progression or approximately inan arithmetic progression in ascending order of spectrum efficiency,where: that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are higher than64QAM, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in the at least three entriesin which the modulation schemes are higher than 64QAM are arrangedapproximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is within a range from aconstant minus a preset value to the constant plus the preset value.

With reference to any one of the sixth to the eighth possibleimplementation manners, in a ninth possible implementation manner, theconstant is less than or equal to a first threshold.

With reference to the first aspect, in a tenth possible implementationmanner, an absolute value of a difference between spectrum efficienciesin any two adjacent entries of X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table is less than or equal to afirst threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table include: at least two entries in which modulationschemes are 256QAM, where an absolute value of a difference betweenspectrum efficiencies in any two adjacent entries of the at least twoentries in which the modulation schemes are 256QAM is less than or equalto a first threshold; or

the first CQI table includes: at least two entries in which modulationschemes are higher than 64QAM, where an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries of the atleast two entries in which the modulation schemes are higher than 64QAMis less than or equal to a first threshold.

With reference to the sixth possible implementation manner or the tenthpossible implementation manner, in an eleventh possible implementationmanner, X=3.

With reference to the ninth possible implementation manner or the tenthpossible implementation manner, in a twelfth possible implementationmanner, the first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

With reference to the first aspect or any one of the first twelvepossible implementation manners, in a thirteenth possible implementationmanner, a value range of a CQI index in the first CQI table is the sameas a value range of a CQI index in the second CQI table.

With reference to a second aspect, a notification method for an MCS isprovided, including:

receiving a first channel quality indicator CQI index sent by terminalUE, where the first CQI index is determined by the UE according to anacquired first CQI table;

determining a first MCS index according to the first CQI table, a firstMCS table, and the received first CQI index; and

sending the determined first MCS index to the UE;

where the first CQI table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second CQI table, and the first combination is N entries withconsecutive maximum CQI indices corresponding to QPSK in the second CQItable, where N is equal to 3 or N is a positive integer less than 4 or Nis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second CQI table, where

modulation schemes in the second CQI table include only QPSK, 16QAM, and64QAM; and

the first MCS table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a second combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the second combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the second aspect, in a first possible implementationmanner, the determining a first MCS index according to the acquiredfirst CQI table, the determined first MCS table, and the received firstCQI index includes:

determining a first TBS index and the first MCS index according to thefirst PRB quantity, the first CQI table, the first MCS table, and thereceived first CQI index, where:

the first PRB quantity is a PRB quantity allocated by a base station tothe UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient;

a first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

With reference to the first possible implementation manner, in a secondpossible implementation manner, the determining a first TBS indexaccording to the first CQI table, a first PRB quantity, a first TBStable, and the received first CQI index includes:

determining, according to the first CQI table and the received first CQIindex, a first modulation scheme and a first spectrum efficiency thatcorrespond to the received first CQI index;

learning, according to the first PRB quantity and the first spectrumefficiency, a first transport block size transmitted to the UE; and

obtaining, according to the first TBS table, the first TBS index thatcorresponds to the first transport block size and the first PRB quantityin the first TBS table.

With reference to the second aspect or either of the first two possibleimplementation manners, in a third possible implementation manner, theat least one entry in which the modulation scheme is QPSK in the secondCQI table includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

With reference to the second aspect or either of the first two possibleimplementation manners, in a fourth possible implementation manner, theat least one entry in which the modulation scheme is 16QAM in the secondCQI table includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or

at least one entry, except an entry corresponding to a minimum CQIindex, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

With reference to the second aspect or any one of the first fourpossible implementation manners, in a fifth possible implementationmanner, the first CQI table further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

With reference to the fifth possible implementation manner, in a sixthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

With reference to the second aspect or any one of the first six possibleimplementation manners, in a seventh possible implementation manner, aspectrum efficiency in an entry that is corresponding to a minimum CQIindex and of the entries in which the modulation schemes are higher than64QAM in the first CQI table is equal to a spectrum efficiency in anentry that is corresponding to a maximum CQI index and of all theentries in which the modulation schemes are 64QAM in the second CQItable.

With reference to the second aspect, in an eighth possibleimplementation manner, spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM in the first CQI table arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency, where: thatspectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM are arranged in an arithmetic progression in ascending orderof spectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the X entries, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged approximately in an arithmeticprogression in ascending order of spectrum efficiency indicates that, inascending order of spectrum efficiency and starting from a second entryof the X entries, a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry iswithin a range from a constant minus a preset value to the constant plusthe preset value, where X is an integer greater than 2.

With reference to the second aspect, in a ninth possible implementationmanner, the entries in which the modulation schemes are higher than64QAM in the first CQI table include: at least three entries in whichmodulation schemes are 256QAM, where spectrum efficiencies in the atleast three entries in which the modulation schemes are 256QAM arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency, where: thatspectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionin ascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are 256QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are 256QAM are arranged approximately in anarithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value.

With reference to the second aspect, in a tenth possible implementationmanner, the first CQI table includes: at least three entries in whichmodulation schemes are higher than 64QAM, where spectrum efficiencies inthe at least three entries in which the modulation schemes are higherthan 64QAM are arranged in an arithmetic progression or approximately inan arithmetic progression in ascending order of spectrum efficiency,where: that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are higher than64QAM, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in the at least three entriesin which the modulation schemes are higher than 64QAM are arrangedapproximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is within a range from aconstant minus a preset value to the constant plus the preset value.

With reference to any one of the eighth to the tenth possibleimplementation manners, in an eleventh possible implementation manner,the constant is less than or equal to a first threshold.

With reference to the second aspect, in a twelfth possibleimplementation manner, an absolute value of a difference betweenspectrum efficiencies in any two adjacent entries of X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM in the first CQI table is lessthan or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table include: at least two entries in which modulationschemes are 256QAM, where an absolute value of a difference betweenspectrum efficiencies in any two adjacent entries of the at least twoentries in which the modulation schemes are 256QAM is less than or equalto a first threshold; or

the first CQI table includes: at least two entries in which modulationschemes are higher than 64QAM, where an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries of the atleast two entries in which the modulation schemes are higher than 64QAMis less than or equal to a first threshold.

With reference to the eighth possible implementation manner or thetwelfth possible implementation manner, in a thirteenth possibleimplementation manner, X=3.

With reference to either of the eleventh and the twelfth possibleimplementation manners, in a fourteenth possible implementation manner,the first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

With reference to the second aspect or any one of the first fourteenpossible implementation manners, in a fifteenth possible implementationmanner, a value range of a CQI index in the first CQI table is the sameas a value range of a CQI index in the second CQI table.

With reference to the second aspect or either of the first two possibleimplementation manners, in a sixteenth possible implementation manner,the at least one entry in which the modulation scheme is QPSK in thesecond MCS table includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the second aspect or either of the first two possibleimplementation manners, in a seventeenth possible implementation manner,the at least one entry in which the modulation scheme is 16QAM in thesecond MCS table includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the second aspect or any one of the first, the second,the sixteenth, and the seventeenth possible implementation manners, inan eighteenth possible implementation manner, the first MCS tablefurther includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

With reference to the eighteenth possible implementation manner, in anineteenth possible implementation manner, the at least one entry inwhich the modulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the eighteenth or the nineteenth possibleimplementation manner, in a twentieth possible implementation manner,the at least one entry in which the modulation scheme is 64QAM in thesecond MCS table includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

With reference to any one of the sixteenth to the twentieth possibleimplementation manners, in a twenty-first possible implementationmanner, a value range of an MCS index in the first MCS table is the sameas a value range of an MCS index in the second MCS table.

With reference to a third aspect, a notification method for an MCS isprovided, including:

receiving, by a base station, a first CQI index, where the first CQIindex is determined by UE according to an acquired first CQI table;

determining a first MCS index according to the first CQI table, a firstMCS table, and the received first CQI index; and

sending the determined first MCS index to the UE;

where the first CQI table includes: entries in which modulation schemesare higher than 64QAM, where an entry in the first CQI table refers toone modulation scheme, one code rate, and one spectrum efficiency thatcorrespond to each CQI index in the first CQI table; and

the first MCS table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the third aspect, in a first possible implementationmanner, the at least one entry in which the modulation scheme is QPSK inthe second MCS table includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the third aspect, in a second possible implementationmanner, the at least one entry in which the modulation scheme is 16QAMin the second MCS table includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the third aspect or either of the first two possibleimplementation manners, in a third possible implementation manner, thefirst MCS table further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

With reference to the third possible implementation manner, in a fourthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the third or the fourth possible implementationmanner, in a fifth possible implementation manner, the at least oneentry in which the modulation scheme is 64QAM in the second MCS tableincludes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

With reference to the third aspect or the first five possibleimplementation manners, in a sixth possible implementation manner, avalue range of an MCS index in the first MCS table is the same as avalue range of an MCS index in the second MCS table.

With reference to a fourth aspect, a notification method for an MCS isprovided, including:

receiving a first MCS index sent by a base station, where the first MCSindex is determined by the base station according to a first MCS table;and

determining a modulation order and a code block size according to thefirst MCS table and the received first MCS index;

where the first MCS table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the fourth aspect, in a first possible implementationmanner, the determining a modulation order and a code block sizeaccording to the first MCS table and the received first MCS indexincludes:

determining a first TBS index and the modulation order according to thefirst MCS table and the received first MCS index; and

determining the code block size according to the first TBS index, afirst PRB quantity, and a first TBS table, where:

the first PRB quantity is a PRB quantity allocated by the base stationto UE, or the first PRB quantity is a maximum integer less than or equalto a product of a PRB quantity allocated to UE and a specificcoefficient;

the first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

With reference to the fourth aspect or the first possible implementationmanner, in a second possible implementation manner, the at least oneentry in which the modulation scheme is QPSK in the second MCS tableincludes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the fourth aspect or the first possible implementationmanner, in a third possible implementation manner, the at least oneentry in which the modulation scheme is 16QAM in the second MCS tableincludes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the fourth aspect or the first three possibleimplementation manners, in a fourth possible implementation manner, thefirst MCS table further includes: at least one entry in which amodulation scheme is 64QAM in the second MCS table.

With reference to the fourth possible implementation manner, in a fifthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the fourth or the fifth possible implementationmanner, in a sixth possible implementation manner, the at least oneentry in which the modulation scheme is 64QAM in the second MCS tableincludes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

With reference to the fourth aspect or any one of the first six possibleimplementation manners, in a seventh possible implementation manner, avalue range of an MCS index in the first MCS table is the same as avalue range of an MCS index in the second MCS table.

With reference to a fifth aspect, a notification apparatus for a CQI isprovided, including:

an acquiring module, configured to acquire a first CQI table;

a first acquiring module, configured to learn a first CQI indexaccording to the first CQI table acquired by the acquiring module; and

a sending module, configured to send the first CQI index acquired by thefirst acquiring module to a base station, so that the base stationdetermines a first modulation and coding scheme MCS index according tothe first CQI index;

where the first CQI table acquired by the acquiring module includes:

entries in which modulation schemes are higher than 64 quadratureamplitude modulation QAM; and

at least one entry in which a modulation scheme is quadrature phaseshift keying QPSK in a second CQI table, where the at least one entry inwhich the modulation scheme is QPSK includes a combination except afirst combination of combinations formed by the at least one entry inwhich the modulation scheme is QPSK in the second CQI table, and thefirst combination is N entries with consecutive maximum CQI indicescorresponding to QPSK in the second CQI table, where N is equal to 3 orN is a positive integer less than 4 or N is a positive integer; and/orat least one entry in which a modulation scheme is 16QAM in the secondCQI table, where

modulation schemes in entries in the second CQI table include only QPSK,16QAM, and 64QAM.

With reference to the fifth aspect, in a first possible implementationmanner, the at least one entry in which the modulation scheme is QPSK inthe second CQI table in the first CQI table acquired by the acquiringmodule includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

With reference to the fifth aspect, in a second possible implementationmanner, the at least one entry in which the modulation scheme is 16QAMin the second CQI table in the first CQI table acquired by the acquiringmodule includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

With reference to the fifth aspect or the first two possibleimplementation manners, in a third possible implementation manner, thefirst CQI table acquired by the acquiring module further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

With reference to the third possible implementation manner, in a fourthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

With reference to the fifth aspect, in a fifth possible implementationmanner, a spectrum efficiency in an entry that is corresponding to aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table acquired by the acquiringmodule is equal to a spectrum efficiency in an entry that iscorresponding to a maximum CQI index and of all entries in whichmodulation schemes are 64QAM in the second CQI table.

With reference to the fifth aspect, in a sixth possible implementationmanner, spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule are arranged in an arithmetic progression or approximately in anarithmetic progression in ascending order of spectrum efficiency, where:that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the Xentries, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the X entries, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value, where X is an integer greater than2.

With reference to the fifth aspect, in a seventh possible implementationmanner, the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the acquiring module include:at least three entries in which modulation schemes are 256QAM, wherespectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

With reference to the fifth aspect, in an eighth possible implementationmanner, the first CQI table acquired by the acquiring module includes:at least three entries in which modulation schemes are higher than64QAM, where spectrum efficiencies in the at least three entries inwhich the modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency, where: that spectrumefficiencies in the at least three entries in which the modulationschemes are higher than 64QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged approximatelyin an arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

With reference to any one of the sixth to the eighth possibleimplementation manners, in a ninth possible implementation manner, theconstant is less than or equal to a first threshold.

With reference to the fifth aspect, in a tenth possible implementationmanner, an absolute value of a difference between spectrum efficienciesin any two adjacent entries of X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule is less than or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the acquiring module include: at least twoentries in which modulation schemes are 256QAM, where an absolute valueof a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the acquiring module includes: at leasttwo entries in which modulation schemes are higher than 64QAM, where anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries of the at least two entries in which the modulationschemes are higher than 64QAM is less than or equal to a firstthreshold.

With reference to the sixth possible implementation manner or the tenthpossible implementation manner, in an eleventh possible implementationmanner, X=3.

With reference to the ninth possible implementation manner or the tenthpossible implementation manner, in a twelfth possible implementationmanner, the first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

With reference to the fifth aspect or any one of the first twelvepossible implementation manners, in a thirteenth possible implementationmanner, a value range of a CQI index in the first CQI table acquired bythe acquiring module is the same as a value range of a CQI index in thesecond CQI table.

With reference to a sixth aspect, a notification apparatus for an MCS isprovided, including:

an acquiring module, configured to acquire a first CQI table and a firstMCS table;

a receiving module, configured to receive a first channel qualityindicator CQI index sent by terminal UE, where the first CQI index isdetermined by the UE according to the first CQI table;

a determining module, configured to determine a first MCS indexaccording to the first CQI table acquired by the acquiring module, thefirst MCS table acquired by the acquiring module, and the first CQIindex received by the receiving module; and

a sending module, configured to send the determined first MCS index tothe UE;

where the first CQI table acquired by the acquiring module includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second CQI table, and the first combination is N entries withconsecutive maximum CQI indices corresponding to QPSK in the second CQItable, where N is equal to 3 or N is a positive integer less than 4 or Nis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second CQI table, where

modulation schemes in the second CQI table include only QPSK, 16QAM, and64QAM; and

the first MCS table acquired by the acquiring module includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a second combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the second combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the sixth aspect, in a first possible implementationmanner, the determining module is specifically configured to:

determine a first TBS index and the first MCS index according to anacquired first PRB quantity, the first CQI table acquired by theacquiring module, the first MCS table acquired by the acquiring module,and the received first CQI index, where:

the first PRB quantity is a PRB quantity allocated by a base station tothe UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient;

a first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

With reference to the first possible implementation manner, in a secondpossible implementation manner, the determining module includes:

a first determining submodule, configured to determine, according to thefirst CQI table acquired by the acquiring module and the received firstCQI index, a first modulation scheme and a first spectrum efficiencythat correspond to the received first CQI index; and

a second determining submodule, configured to learn, according to thefirst PRB quantity and the first spectrum efficiency, a first transportblock size transmitted to the UE; and obtain, according to the first TBStable, the first TBS index that corresponds to the first transport blocksize and the first PRB quantity in the first TBS table.

With reference to the sixth aspect or either of the first two possibleimplementation manners, in a third possible implementation manner, theat least one entry in which the modulation scheme is QPSK in the secondCQI table includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

With reference to the sixth aspect or either of the first two possibleimplementation manners, in a fourth possible implementation manner, theat least one entry in which the modulation scheme is 16QAM in the secondCQI table in the first CQI table acquired by the acquiring moduleincludes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

With reference to the sixth aspect or any one of the first four possibleimplementation manners, in a fifth possible implementation manner, thefirst CQI table acquired by the acquiring module further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

With reference to the fifth possible implementation manner, in a sixthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

With reference to the sixth aspect or any one of the first six possibleimplementation manners, in a seventh possible implementation manner, aspectrum efficiency in an entry that is corresponding to a minimum CQIindex and of the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the acquiring module is equalto a spectrum efficiency in an entry corresponding to a maximum CQIindex of all the entries in which the modulation schemes are 64QAM inthe second CQI table.

With reference to the sixth aspect, in an eighth possible implementationmanner, spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule are arranged in an arithmetic progression or approximately in anarithmetic progression in ascending order of spectrum efficiency, where:that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the Xentries, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the X entries, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value, where X is an integer greater than2.

With reference to the sixth aspect, in a ninth possible implementationmanner, the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the acquiring module include:at least three entries in which modulation schemes are 256QAM, wherespectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

With reference to the sixth aspect, in a tenth possible implementationmanner, the first CQI table acquired by the acquiring module includes:at least three entries in which modulation schemes are higher than64QAM, where spectrum efficiencies in the at least three entries inwhich the modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency, where: that spectrumefficiencies in the at least three entries in which the modulationschemes are higher than 64QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged approximatelyin an arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

With reference to any one of the eighth to the tenth possibleimplementation manners, in an eleventh possible implementation manner,the constant is less than or equal to a first threshold.

With reference to the sixth aspect, in a twelfth possible implementationmanner, an absolute value of a difference between spectrum efficienciesin any two adjacent entries of X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule is less than or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the acquiring module include: at least twoentries in which modulation schemes are 256QAM, where an absolute valueof a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the acquiring module includes: at leasttwo entries in which modulation schemes are higher than 64QAM, where anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries of the at least two entries in which the modulationschemes are higher than 64QAM is less than or equal to a firstthreshold.

With reference to the eighth possible implementation manner or thetwelfth possible implementation manner, in a thirteenth possibleimplementation manner, X=3.

With reference to either of the eleventh to the twelfth possibleimplementation manners, in a fourteenth possible implementation manner,the first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

With reference to the sixth aspect or any one of the first fourteenpossible implementation manners, in a fifteenth possible implementationmanner, a value range of a CQI index in the first CQI table acquired bythe acquiring module is the same as a value range of a CQI index in thesecond CQI table.

With reference to the sixth aspect or either of the first two possibleimplementation manners, in a sixteenth possible implementation manner,the at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first MCS table acquired by the acquiring moduleincludes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the sixth aspect or either of the first two possibleimplementation manners, in a seventeenth possible implementation manner,the at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first MCS table acquired by the acquiring moduleincludes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the sixth aspect or any one of the first, the second,the sixteenth, and the seventeenth possible implementation manners, inan eighteenth possible implementation manner, the first MCS tableacquired by the acquiring module further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

With reference to the eighteenth possible implementation manner, in anineteenth possible implementation manner, the at least one entry inwhich the modulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the eighteenth or the nineteenth possibleimplementation manner, in a twentieth possible implementation manner,the at least one entry in which the modulation scheme is 64QAM in thesecond MCS table includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table acquired by the acquiring module is the same as a TBSindex in an entry with a maximum MCS index of all the entries in whichthe modulation schemes are 64QAM in the second MCS table.

With reference to any one of the sixteenth to the twentieth possibleimplementation manners, in a twenty-first possible implementationmanner, a value range of an MCS index in the first MCS table acquired bythe acquiring module is the same as a value range of an MCS index in thesecond MCS table.

With reference to a seventh aspect, a notification apparatus for an MCSis provided, including:

an acquiring module, configured to acquire a first CQI table and a firstMCS table;

a receiving module, configured to receive, by a base station, a firstCQI index, where the first CQI index is determined by UE according tothe first CQI table;

a determining module, configured to determine a first MCS indexaccording to the first CQI table acquired by the acquiring module, thefirst MCS table acquired by the acquiring module, and the first CQIindex received by the receiving module; and

a sending module, configured to send the first MCS index determined bythe determining module to the UE;

where the first CQI table acquired by the acquiring module includes:entries in which modulation schemes are higher than 64QAM, where anentry in the first CQI table acquired by the acquiring module refers toone modulation scheme, one code rate, and one spectrum efficiency thatcorrespond to each CQI index in the first CQI table acquired by theacquiring module; and

the first MCS table acquired by the acquiring module includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the seventh aspect, in a first possible implementationmanner, the at least one entry in which the modulation scheme is QPSK inthe second MCS table includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the seventh aspect, in a second possibleimplementation manner, the at least one entry in which the modulationscheme is 16QAM in the second MCS table in the first MCS table acquiredby the acquiring module includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the seventh aspect or either of the first two possibleimplementation manners, in a third possible implementation manner, thefirst MCS table acquired by the acquiring module further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

With reference to the third possible implementation manner, in a fourthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the third or the fourth possible implementationmanner, in a fifth possible implementation manner, the at least oneentry in which the modulation scheme is 64QAM in the second MCS tableincludes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table acquired by the acquiring module is the same as a TBSindex in an entry with a maximum MCS index of all the entries in whichthe modulation schemes are 64QAM in the second MCS table.

With reference to the seventh aspect or the first five possibleimplementation manners, in a sixth possible implementation manner, avalue range of an MCS index in the first MCS table acquired by theacquiring module is the same as a value range of an MCS index in thesecond MCS table.

With reference to an eighth aspect, a notification apparatus for an MCSis provided, including:

an acquiring module, configured to acquire a first MCS table;

a receiving module, configured to receive a first MCS index sent by abase station, where the first MCS index is determined by the basestation according to the first MCS table acquired by the acquiringmodule; and

a determining module, configured to determine a modulation order and acode block size according to the first MCS table acquired by theacquiring module and the first MCS index received by the receivingmodule;

where the first MCS table acquired by the acquiring module includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

With reference to the eighth aspect, in a first possible implementationmanner, the determining module includes:

a first determining submodule, configured to determine a first TBS indexand the modulation order according to the first MCS table acquired bythe acquiring module and the received first MCS index; and

a second determining submodule, configured to determine the code blocksize according to the first TBS index, a first PRB quantity, and a firstTBS table, where:

the first PRB quantity is a PRB quantity allocated by the base stationto UE, or the first PRB quantity is a maximum integer less than or equalto a product of a PRB quantity allocated to UE and a specificcoefficient;

the first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

With reference to the eighth aspect or the first possible implementationmanner, in a second possible implementation manner, the at least oneentry in which the modulation scheme is QPSK in the second MCS tableincludes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

With reference to the eighth aspect or the first possible implementationmanner, in a third possible implementation manner, the at least oneentry in which the modulation scheme is 16QAM in the second MCS tableincludes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

With reference to the eighth aspect or any one of the first threepossible implementation manners, in a fourth possible implementationmanner, the first MCS table acquired by the acquiring module furtherincludes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

With reference to the fourth possible implementation manner, in a fifthpossible implementation manner, the at least one entry in which themodulation scheme is 64QAM in the second MCS table includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

With reference to the fourth or the fifth possible implementationmanner, in a sixth possible implementation manner, the at least oneentry in which the modulation scheme is 64QAM in the second MCS tableincludes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table acquired by the acquiring module is the same as a TBSindex in an entry with a maximum MCS index of all the entries in whichthe modulation schemes are 64QAM in the second MCS table.

With reference to the eighth aspect or the first six possibleimplementation manners, in a seventh possible implementation manner, avalue range of an MCS index in the first MCS table acquired by theacquiring module is the same as a value range of an MCS index in thesecond MCS table.

With reference to a ninth aspect, a notification apparatus for a channelquality indicator CQI is provided, including:

a memory and a processor connected to the memory, and further includinga transmitter, where the memory stores a set of program code, and theprocessor is configured to call the program code stored in the memory toperform the method according to the first aspect or any one of thepossible implementation manners of the first aspect; and the sender isconfigured to send a first CQI index that is obtained by calling, by theprocessor, the program code stored in the memory to perform the methodaccording to the first aspect or any one of the possible implementationmanners of the first aspect.

With reference to a tenth aspect, a notification apparatus for amodulation and coding scheme MCS is provided, including:

a memory and a processor connected to the memory, and further includinga sender and a receiver, where

the memory stores a set of program code, and the processor is configuredto call the program code stored in the memory to perform the methodaccording to the second aspect or any one of the possible implementationmanners of the second aspect; and

the receiver is configured to receive a first CQI index sent by UE; andthe sender is configured to send a first MCS index that is obtained bycalling, by the processor, the program code stored in the memory toperform the method according to the second aspect or any one of thepossible implementation manners of the second aspect.

With reference to an eleventh aspect, a notification apparatus for amodulation and coding scheme MCS is provided, including a memory and aprocessor connected to the memory, and further including a sender and areceiver, where

the memory stores a set of program code, and the processor is configuredto call the program code stored in the memory to perform the methodaccording to the third aspect or any one of the possible implementationmanners of the third aspect; and

the receiver is configured to receive a first CQI index sent by UE; andthe sender is configured to send a first MCS index that is obtained bycalling, by the processor, the program code stored in the memory toperform the method according to the third aspect or any one of thepossible implementation manners of the third aspect.

With reference to a twelfth aspect, a notification apparatus for amodulation and coding scheme MCS is provided, including a memory and aprocessor connected to the memory, and further including a receiver,where the memory stores a set of program code, and the processor isconfigured to call the program code stored in the memory to perform themethod according to the fourth aspect or any one of the possibleimplementation manners of the fourth aspect; and

the receiver is configured to receive a first MCS index sent by a basestation.

The present invention provides a notification method and apparatus for achannel quality indicator and a modulation and coding scheme, whichsupports UE in selecting a modulation scheme higher than 64QAM andnotifying a base station by using a method of sending a CQI index, andmeanwhile supports the base station in selecting a modulation schemehigher than 64QAM and notifying the UE by using a method of sending anMCS index. Using the modulation scheme higher than 64QAM can providehigher quantization accuracy for an area with a high signal-to-noiseratio, thereby improving system performance.

The present invention provides a notification method and apparatus for achannel quality indicator and a modulation and coding scheme, which canfurther support UE in selecting a low spectrum efficiency and notifyinga base station by using a method of sending a CQI index, and meanwhilecan support the base station in selecting a small transport block sizeand notifying the UE by using a method of sending an MCS index, so as toensure that the UE can also adapt to an unexpected low signal-to-noiseratio scenario when the UE uses a high-order modulation scheme, that is,to ensure that the UE can adapt to a dramatic change of asignal-to-noise ratio.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention more clearly, the following briefly introduces theaccompanying drawings required for describing the embodiments.Apparently, the accompanying drawings in the following description showmerely some embodiments of the present invention, and persons ofordinary skill in the art may still derive other drawings from theseaccompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a notification method for a CQIaccording to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a notification method for an MCSaccording to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another notification method for an MCSaccording to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another notification method for an MCSaccording to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a notification apparatus for a CQIaccording to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a notification apparatus for an MCSaccording to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another notification apparatus for anMCS according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another notification apparatus for anMCS according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another notification apparatus for aCQI according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of another notification apparatus for anMCS according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another notification apparatus for anMCS according to an embodiment of the present invention; and

FIG. 12 is a schematic diagram of another notification apparatus for anMCS according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The following clearly describes the technical solutions in theembodiments of the present invention with reference to the accompanyingdrawings in the embodiments of the present invention. Apparently, thedescribed embodiments are merely some but not all of the embodiments ofthe present invention. All other embodiments obtained by persons ofordinary skill in the art based on the embodiments of the presentinvention without creative efforts shall fall within the protectionscope of the present invention.

An adaptive procedure for a physical downlink shared channel (PDSCH) isas follows:

First, user equipment (UE) estimates channel information used formeasuring channel state information (CSI); second, the UE calculates asignal to interference plus noise ratio (SINR) by using the channelinformation and based on an optimal rank indication (RI) and/or aprecoding matrix indication (PMI); and then, the UE obtains acorresponding channel quality indicator (CQI) according to the SINR, andreports a CQI value to a base station.

In addition, in the present invention, a modulation order corresponds toa modulation scheme. Exemplarily, if a modulation scheme is quadraturephase shift keying (QPSK), a modulation order is 2; if a modulationscheme is 16QAM, a modulation order is 4; if a modulation scheme is64QAM, a modulation order is 6; if a modulation scheme is 256QAM, amodulation order is 8.

The following describes in detail a notification method for a CQIprovided by an embodiment of the present invention with reference to theaccompanying drawings.

As shown in FIG. 1, steps of the notification method for a CQI are asfollows:

S101: UE learns a first CQI index according to an acquired first CQItable.

The first CQI table may be predefined in a protocol, for example, presetby the UE according to protocol specifications, or pre-stored by the UE;or may be selected by the UE from at least two predefined tablesaccording to a downlink channel state; or may be notified by a basestation to the UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table. A first CQI table isused for describing a mapping relationship between a CQI index and anentry. In this embodiment of the present invention, the mappingrelationship in the CQI table is merely an example given for theconvenience of understanding the present invention, and a representationform of the CQI table in the present invention includes, but is notlimited to, the example. That is, the CQI table may have multiplecombinations, and the combinations shall fall within the protectionscope of the present invention as long as a mapping relationship betweena CQI index and an entry can be reflected.

Specifically, the UE determines a first spectrum efficiency according toa measured first SINR, and then acquires, according to the firstspectrum efficiency and the first CQI table, a first CQI indexcorresponding to the first spectrum efficiency, where the first CQItable is pre-stored by the UE.

The first CQI table may include:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK may include a combination except a first combination ofcombinations formed by the at least one entry in which the modulationscheme is QPSK in the second CQI table, and the first combination is Nentries with consecutive maximum CQI indices corresponding to QPSK inthe second CQI table, where N is equal to 3 or N is a positive integerless than 4 or N is a positive integer; and/or at least one entry inwhich a modulation scheme is 16QAM in the second CQI table, where

modulation schemes in entries in the second CQI table may include onlyQPSK, 16QAM, and 64QAM.

That is, the first CQI table includes the entries in which themodulation schemes are higher than 64QAM; the first CQI table mayfurther include the at least one entry in which the modulation scheme isQPSK in the second CQI table, and at least one entry in which modulationschemes are QPSK in the first CQI table cannot only be the N entriesthat are corresponding to the consecutive maximum CQI indices and of theentries in which the modulation schemes are QPSK in the second CQItable, where N may be equal to 3 or N may be a positive integer lessthan 4 or N may be a positive integer; and/or the first CQI tablefurther includes the at least one entry in which the modulation schemeis 16QAM in the second CQI table.

Further, values of N are merely several examples given in the presentinvention, and the present invention includes, but is not limited to,the examples.

The modulation schemes in the entries in the second CQI table includeonly QPSK, 16QAM, and 64QAM. An entry in the first CQI table may referto one modulation scheme, one code rate, and one spectrum efficiencythat correspond to each CQI index in the first CQI table, and an entryin the second CQI table refers to one modulation scheme, one code rate,and one spectrum efficiency that correspond to each CQI index in thesecond CQI table. Certainly, an entry in the present invention may beset according to uplink state information or downlink state information,and entries in the first CQI table and the second CQI table are merelyexamples given in the present invention, and the present inventionincludes, but is not limited to, the examples.

In addition, the combination is a combination formed by the at least oneentry in which the modulation scheme is QPSK in the second CQI table.Using a second CQI table shown in Table 1 as an example, there are intotal 2⁶−1=63 combinations formed by at least one entry in which amodulation scheme is QPSK in the second CQI table. For example, thecombination may be a combination formed by an entry corresponding to aCQI index 6 in the second CQI table, may be a combination formed byentries corresponding to CQI indices 4, 5, and 6 in the second CQItable, may be a combination formed by entries corresponding to CQIindices 3, 5, and 6 in the second CQI table, or the like.

Specifically, there may be three types of first CQI tables as follows:

a first type of first CQI table: including only entries in whichmodulation schemes are QPSK and entries in which modulation schemes arehigher than 64QAM;

a second type of first CQI table: including only entries in whichmodulation schemes are 16QAM and entries in which modulation schemes arehigher than 64QAM; and

a third type of first CQI table: including only entries in whichmodulation schemes are QPSK, entries in which modulation schemes are16QAM, and entries in which modulation schemes are higher than 64QAM.

There may be multiple types of first CQI tables in the presentinvention, the foregoing three types of first CQI tables are merelyexamples given for ease of understanding the present invention, and thepresent invention includes, but is not limited to, the examples.

For the convenience of understanding, the following CQI table (that is,the second CQI table) is used as an example for description.

TABLE 1 Spectrum CQI index Modulation scheme Code rate × 1024 efficiency(CQI index) (modulation) (code rate × 1024) (efficiency) 0 Out of range(out of range) 1 QPSK 78 0.1523 2 QPSK 120 0.2344 3 QPSK 193 0.3770 4QPSK 308 0.6016 5 QPSK 449 0.8770 6 QPSK 602 1.1758 7 16QAM 378 1.4766 816QAM 490 1.9141 9 16QAM 616 2.4063 10 64QAM 466 2.7305 11 64QAM 5673.3223 12 64QAM 666 3.9023 13 64QAM 772 4.5234 14 64QAM 873 5.1152 1564QAM 948 5.5547

The first CQI table includes the entries in which the modulation schemesare higher than 64QAM, and exemplarily, a quantity of included entriesin which modulation schemes are higher than 64QAM may be one or more.

Exemplarily, a modulation scheme higher than 64QAM and included in thefirst CQI table may be 128QAM and/or 256QAM. If the first CQI tableincludes an entry only of one modulation scheme, the modulation schemein the entry may be any modulation scheme of 128QAM, 256QAM, and anothermodulation scheme with a higher modulation scheme; if the first CQItable includes entries of multiple modulation schemes, the multiplemodulation schemes included in the first CQI table may be any multiplemodulation schemes of 128QAM, 256QAM, and another modulation scheme witha higher modulation scheme.

Exemplarily, the entries in which the modulation schemes are higher than64QAM and that may be included in the first CQI table are shown in thefollowing table.

TABLE 2 Spectrum CQI index Modulation scheme Code rate × 1024 efficiency(CQI index) (modulation) (code rate × 1024) (efficiency) 13 128QAM 7786.0800 14 128QAM 860 6.7200 15 256QAM 942 7.3600

It should be noted that, in order to reduce a change to the prior art ina specific implementation process, preferably, a range of a CQI index inthe first CQI table and a range of a CQI index in the second CQI tablemay be the same, which may be specifically 0 to 15. Certainly, the rangeof a CQI index in the first CQI table may also be greater than the rangeof a CQI index in the second CQI table, and exemplarily, the range of aCQI index in the first CQI table may be 0 to 20. The CQI indices in thisembodiment of the present invention are merely examples given for theconvenience of understanding the present invention, and the range of aCQI index in the present invention includes, but is not limited to, theexamples.

For the first type of first CQI table, the first type of first CQI tableincludes only the entries in which the modulation schemes are QPSK andthe entries in which the modulation schemes are higher than 64QAM.

A quantity of entries in which the modulation schemes are higher than64QAM and that are included in the first CQI table may be one or more,and each entry in which the modulation scheme is higher than 64QAMincludes a modulation scheme, a code rate, and a spectrum efficiency,and has a corresponding CQI index.

The first CQI table may further include some entries in which modulationschemes are QPSK in the second CQI table, that is, some entries of 6entries in which modulation schemes are QPSK and that correspond to CQIindices 1 to 6 in the second CQI table (that is, in the table 1), andthe entries in which the modulation schemes are QPSK in the first CQItable are not N entries that are corresponding to consecutive maximumCQI indices and of the entries in which the modulation schemes are QPSKin the second CQI table, where N is equal to 3. That is, the entries inwhich the modulation schemes are QPSK in the first CQI table cannot onlybe the entries corresponding to the CQI indices 4, 5, and 6 in thesecond CQI table.

Alternatively, the first CQI table may further include some entries inwhich modulation schemes are QPSK in the second CQI table, that is, someentries of 6 entries in which modulation schemes are QPSK and thatcorrespond to CQI indices 1 to 6 in the second CQI table, and theentries in which the modulation schemes are QPSK in the first CQI tableare not N entries with consecutive maximum CQI indices of the entries inwhich the modulation schemes are QPSK in the second CQI table, where Nis a positive integer and N is less than 4, that is, N may be equal to1, 2, or 3, where

if N is equal to 1, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entry corresponding to the CQIindex 6 in the second CQI table; or

if N is equal to 2, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 5 and 6 in the second CQI table; or

if N is equal to 3, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 4, 5, and 6 in the second CQI table.

Alternatively, the first CQI table further includes some entries inwhich modulation schemes are QPSK in the second CQI table, that is, someentries of 6 entries in which modulation schemes are QPSK and thatcorrespond to CQI indices 1 to 6 in the second CQI table, and theentries in which the modulation schemes are QPSK in the first CQI tableare not N entries that are corresponding to consecutive maximum CQIindices and of the entries in which the modulation schemes are QPSK inthe second CQI table, where N is a positive integer. That is, a valuerange of N may be 1 to 5, where

if N is equal to 1, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entry corresponding to the CQIindex 6 in the second CQI table; or

if N is equal to 2, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 5 and 6 in the second CQI table; or

if N is equal to 3, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 4, 5, and 6 in the second CQI table; or

if N is equal to 4, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 3, 4, 5, and 6 in the second CQI table; or

if N is equal to 5, the entries in which the modulation schemes are QPSKin the first CQI table cannot only be the entries corresponding to theCQI indices 2, 3, 4, 5, and 6 in the second CQI table.

Further, values of N are merely several examples given in the presentinvention, and the present invention includes, but is not limited to,the examples.

Alternatively, the entries in which the modulation schemes are QPSK inthe first CQI table include some entries in which modulation schemes areQPSK in the second CQI table, where CQI indices corresponding to thesome entries are at equal intervals.

Exemplarily, if the entries in which the modulation schemes are QPSK inthe first CQI table include 3 entries in which modulation schemes areQPSK in the second CQI table, the entries in which the modulationschemes are QPSK in the first CQI table may include the entriescorresponding to the CQI indices 1, 3, and 5 in the second CQI table, orthe entries in which the modulation schemes are QPSK in the first CQItable may include the entries corresponding to the CQI indices 2, 4, and6 in the second CQI table.

Alternatively, the entries in which the modulation schemes are QPSK inthe first CQI table include some entries in which modulation schemes areQPSK in the second CQI table, where CQI indices corresponding to thesome entries are not at equal intervals.

Exemplarily, if the entries in which the modulation schemes are QPSK inthe first CQI table include 3 entries in which modulation schemes areQPSK in the second CQI table, the entries in which the modulationschemes are QPSK in the first CQI table may include the entriescorresponding to the CQI indices 1, 4, and 6 in the second CQI table, orthe entries in which the modulation schemes are QPSK in the first CQItable may include the entries corresponding to the CQI indices 2, 5, and6 in the second CQI table; or

if the entries in which the modulation schemes are QPSK in the first CQItable include 4 entries in which modulation schemes are QPSK in thesecond CQI table, the entries in which the modulation schemes are QPSKin the first CQI table may include the entries corresponding to the CQIindices 1, 3, 4, and 6 in the second CQI table; or

if the entries in which the modulation schemes are QPSK in the first CQItable include 5 entries in which modulation schemes are QPSK in thesecond CQI table, the entries in which the modulation schemes are QPSKin the first CQI table may include the entries corresponding to the CQIindices 1, 2, 3, 4, and 6 in the second CQI table.

Alternatively, the entries in which the modulation schemes are QPSK inthe first CQI table include some entries in which modulation schemes areQPSK in the second CQI table, and at least one entry, except an entrycorresponding to a maximum CQI index, of all entries in which modulationschemes are QPSK in the second CQI table, where CQI indicescorresponding to the some entries are inconsecutive.

Exemplarily, the entries in which the modulation schemes are QPSK in thefirst CQI table may include the entries corresponding to the CQI indices1 and 3 in the second CQI table, or the entries in which the modulationschemes are QPSK in the first CQI table may include the entriescorresponding to the CQI indices 2, 4, and 5 in the second CQI table.

Alternatively, the entries in which the modulation schemes are QPSK inthe first CQI table include some entries in which modulation schemes areQPSK in the second CQI table, and at least one entry, except an entrycorresponding to a maximum CQI index, of all entries in which modulationschemes are QPSK in the CQI table, where CQI indices corresponding tothe some entries are consecutive.

Exemplarily, the entries in which the modulation schemes are QPSK in thefirst CQI table may include the entries corresponding to the CQI indices2, 3, and 4 in the second CQI table, or the entries in which themodulation schemes are QPSK in the first CQI table may include theentries corresponding to the CQI indices 2, 3, 4, and 5 in the secondCQI table.

For the second type of first CQI table, the second type of CQI tableincludes only the entries in which the modulation schemes are 16QAM andthe entries in which the modulation schemes are higher than 64QAM.

A quantity of entries in which the modulation schemes are higher than64QAM and that are included in the first CQI table may be one or more,and each entry in which the modulation scheme is higher than 64QAMincludes a modulation scheme, a code rate, and a spectrum efficiency,and has a corresponding CQI index.

The first CQI table further includes all entries in which modulationschemes are 16QAM in the second CQI table.

Exemplarily, the first CQI table further includes 3 entries in whichcorresponding modulation schemes are 16QAM and that correspond to CQIindices 7 to 9, of the entries in which the modulation schemes are 16QAMin the second CQI table.

Alternatively, specifically, the first CQI table further includes someentries in which modulation schemes are 16QAM in the second CQI tableand at least one entry, except an entry corresponding to a minimum CQIindex, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

Exemplarily, the entries in which the modulation schemes are 16QAM inthe first CQI table may further include entries corresponding to CQIindices 8 and 9 in the second CQI table, or the entries in which themodulation schemes are 16QAM in the first CQI table may include an entrycorresponding to a CQI index 8 or 9 in the second CQI table.

For the third type of first CQI table, based on the first type of firstCQI table, entries in which modulation schemes are 16QAM are added toobtain the third type of first CQI table. The third type of first CQItable includes only the entries in which the modulation schemes areQPSK, the entries in which the modulation schemes are 16QAM, and theentries in which the modulation schemes are higher than 64QAM. An entryin which a modulation scheme is 16QAM and that is included in the thirdtype of first CQI table may be the same as an entry in which amodulation scheme is 16QAM and that is included in the second type offirst CQI table.

Specifically, the first CQI table further includes all entries in whichmodulation schemes are 16QAM in the second CQI table.

Alternatively, specifically, the first CQI table further includes someentries in which modulation schemes are 16QAM in the second CQI tableand at least one entry, except an entry corresponding to a minimum CQIindex, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

Further, the first CQI table further includes at least one entry inwhich a modulation scheme is 64QAM in the second CQI table.

That is, based on the first type of first CQI table, entries in whichmodulation schemes are 64QAM are added to obtain a fourth type of firstCQI table; in this case, the fourth type of first CQI table includesentries in which modulation schemes are QPSK, entries in whichmodulation schemes are higher than 64QAM, and entries in whichmodulation schemes are 64QAM.

Alternatively, based on the second type of first CQI table, entries inwhich modulation schemes are 64QAM are added to obtain a fifth type offirst CQI table; in this case, the fifth type of first CQI tableincludes entries in which modulation schemes are higher than 64QAM,entries in which modulation schemes are 16QAM, and entries in whichmodulation schemes are 64QAM.

Alternatively, based on the third type of first CQI table, entries inwhich modulation schemes are 64QAM are added to obtain a sixth type offirst CQI table; in this case, the sixth type of first CQI tableincludes entries in which modulation schemes are higher than 64QAM, andentries in which modulation schemes are QPSK, entries in whichmodulation schemes are 16QAM, and entries in which modulation schemesare 64QAM.

The entries in which the modulation schemes are 64QAM in the fourth,fifth, and sixth types of first CQI tables are as follows:

Specifically, the first CQI table further includes all entries in whichmodulation schemes are 64QAM in the second CQI table.

Exemplarily, the first CQI table includes 6 entries in which themodulation schemes are 64QAM in the second CQI table correspond to 6entries in which modulation schemes are 64QAM and that correspond tosecond CQI indices 10 to 15.

Alternatively, specifically, the first CQI table further includes someentries in which modulation schemes are 64QAM in the second CQI table,and at least one entry, except an entry corresponding to a maximum CQIindex, of all entries in which modulation schemes are 64QAM in thesecond CQI table.

Exemplarily, the entries in which the modulation schemes are 64QAM inthe first CQI table may further include entries corresponding to CQIindices 10 to M in the second CQI table, where M may be 11, 12, 13, or14; the entries in which the modulation schemes are 64QAM in the firstCQI table may further include entries corresponding to CQI indices 10,12, and 14 in the second CQI table; the entries in which the modulationschemes are 64QAM in the first CQI table may further include entriescorresponding to CQI indices 10 and 13 in the second CQI table; or theentries in which the modulation schemes are 64QAM in the first CQI tablemay further include entries corresponding to CQI indices 10, 13, and 14in the second CQI table.

Further, in the foregoing six types of first CQI tables, a spectrumefficiency in an entry that is corresponding to a minimum CQI index andof the entries in which the modulation schemes are higher than 64QAM maybe equal to a spectrum efficiency in an entry that is corresponding to amaximum CQI index and of all the entries in which the modulation schemesare 64QAM in the second CQI table.

Exemplarily, assume that in the first CQI table, there are 3 entries inwhich modulation schemes are QPSK, and corresponding CQI indices are 1to 3; there are 3 entries in which modulation schemes are 16QAM, andcorresponding CQI indices are 4 to 6; there are 5 entries in whichmodulation schemes are 64QAM, and corresponding CQI indices are 7 to 11;and a range of a CQI index in the first CQI table is 0 to 15. Then,there are 4 entries in which modulation schemes are higher than 64QAM inthe first CQI table, and corresponding CQI indices are 12 to 15; and anentry with a minimum CQI index is 12. Then specifically, as shown in thefollowing table, an entry corresponding to the CQI index 12 in the firstCQI table is the entry corresponding to the CQI index 15 in the secondCQI table shown in Table 1.

As can be known from Table 3, entries corresponding to a same CQI indexin the first CQI table and in the second CQI table may be the same, forexample, when the CQI index is 1; entries corresponding to a same CQIindex in the first CQI table and in the second CQI table may bedifferent, for example, when the CQI index is 5, 9, or 10.

TABLE 3 CQI index in the first CQI CQI index in the Code table secondCQI table Modulation rate × 1024 Efficiency 0 0 Out of range 1 1 QPSK 780.1523 2 3 QPSK 193 0.3770 3 5 QPSK 449 0.8770 4 7 16QAM 378 1.4766 5 816QAM 490 1.9141 6 9 16QAM 616 2.4063 7 10 64QAM 466 2.7305 8 11 64QAM567 3.3223 9 12 64QAM 666 3.9023 10 13 64QAM 772 4.5234 11 14 64QAM 8735.1152 12 15 256QAM 711 5.5547 13 — 256QAM 778 6.0800 14 — 256QAM 8606.7200 15 — 256QAM 942 7.3600

As can be seen, the foregoing six types of first CQI tables all includean entry in which a modulation scheme is higher than 64QAM, so as tosupport the UE in selecting a modulation scheme higher than 64QAM andnotifying the base station by using a method of sending a CQI index,thereby improving system performance. In addition, the sixth type offirst CQI table that includes entries in which modulation schemes areQPSK, 16QAM, and 64QAM and entries in which modulation schemes arehigher than 64QAM is a preferred first CQI table.

Further, in the foregoing six types of first CQI tables, spectrumefficiencies in X entries that are corresponding to maximum CQI indicesand of the entries in which the modulation schemes are higher than 64QAMin the first CQI table are arranged in an arithmetic progression orapproximately in an arithmetic progression in ascending order ofspectrum efficiency, where X is an integer greater than 2.

Specifically, that spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM are arranged in an arithmeticprogression in ascending order of spectrum efficiency indicates that, inascending order of spectrum efficiency and starting from a second entryof the X entries, a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry isequal to a same constant.

That spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged approximately in an arithmeticprogression in ascending order of spectrum efficiency indicates that, inascending order of spectrum efficiency and starting from a second entryof the X entries, a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry iswithin a range from a constant minus a preset value to the constant plusthe preset value.

That is, assuming that the spectrum efficiencies in the X entries thatare corresponding to the maximum CQI indices and of the entries in whichthe modulation schemes are higher than 64QAM are (m₁, m₂, . . . ,m_(X)), starting from the second entry of the X entries, the differencebetween the spectrum efficiency in each entry and the spectrumefficiency in the previous entry of the entry is calculated and denotedas t_(i), where 1≤i≤X−1, that is, (t₁, t₂, . . . , t_(X−1)), andt_(i)=m_(i+1)−m_(i).

If all values in (t₁, t₂, . . . , t_(X−1)) are equal (are a constant),the spectrum efficiencies in the X entries that are corresponding to themaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table are arranged in anarithmetic progression in ascending order of spectrum efficiency, wherethe constant is referred to as a common difference of the arithmeticprogression.

If there is a constant enabling all absolute values of differencesbetween all the values in (t₁, t₂, . . . , t_(X−1)) and the constant tobe within a preset value range, the spectrum efficiencies in the Xentries that are corresponding to the maximum CQI indices and of theentries in which the modulation schemes are higher than 64QAM in thefirst CQI table are arranged approximately in an arithmetic progressionin ascending order of spectrum efficiency, which may also be understoodas: if an absolute value of a difference between any two adjacent valuesin (t₁, t₂, . . . , t_(X−1)) is less than a preset value, each value in(t₁, t₂, . . . , t_(X−1)) is approximately equal, and then, the spectrumefficiencies in the X entries that are corresponding to the maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM in the first CQI table are arranged approximately in anarithmetic progression in ascending order of spectrum efficiency, wherethe constant is referred to as a common difference of the approximatearithmetic progression.

Preferably, X=3.

Exemplarily, using X=3 as an example, 3 entries that are correspondingto the maximum CQI indices and of the entries in which the modulationschemes are higher than 64QAM in the first CQI table are shown in Table4.

TABLE 4 CQI index Modulation Code rate × 1024 Efficiency 13 256QAM 7786.0800 14 256QAM 860 6.7200 15 256QAM 942 7.3600

As shown in Table 4, spectrum efficiencies corresponding to entries withCQI indices 13 to 15 are 6.08, 6.72, and 7.36 respectively; startingfrom the second entry (that is, from the entry with the CQI index 14), adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to 0.64, and then,the spectrum efficiencies in the 3 entries that are corresponding to themaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table are arranged in anarithmetic progression in ascending order of spectrum efficiency.

Exemplarily, using X=3 as an example, 3 entries that are correspondingto the maximum CQI indices and of the entries in which the modulationschemes are higher than 64QAM in the first CQI table are shown in Table5.

TABLE 5 CQI index Modulation Code rate × 1024 Efficiency 13 256QAM 7786.0781 14 256QAM 860 6.7188 15 256QAM 942 7.3594

As shown in Table 5, spectrum efficiencies corresponding to the entrieswith the CQI indices 13 to 15 are 6.0781, 6.7188, and 7.3594respectively; starting from the second entry (that is, from the entrywith the CQI index 14), a difference between a spectrum efficiency ineach entry and a spectrum efficiency in a previous entry of the entry isequal to 0.6407 and 0.6406 separately. Assuming that the preset value is0.001, because an absolute value of a difference between 0.6407 and0.6406 is equal to 0.0001, which is less than 0.001, 0.6407 isapproximately equal to 0.6406, and then, the spectrum efficiencies inthe 3 entries that are corresponding to the maximum CQI indices and ofthe entries in which the modulation schemes are higher than 64QAM in thefirst CQI table are arranged approximately in an arithmetic progressionin ascending order of spectrum efficiency.

Alternatively, as shown in Table 5, spectrum efficiencies correspondingto the entries with the CQI indices 13 to 15 are 6.0781, 6.7188, and7.3594 respectively; assuming that the preset value is 0.001, startingfrom the second entry (that is, from the entry with the CQI index 14), adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry is within a range from 0.64 minus 0.001to 0.64 plus 0.001, and then, the spectrum efficiencies in the 3 entriesthat are corresponding to the maximum CQI indices and of the entries inwhich the modulation schemes are higher than 64QAM in the first CQItable are arranged approximately in an arithmetic progression inascending order of spectrum efficiency.

Further, in the foregoing six types of first CQI tables, the entries inwhich the modulation schemes are higher than 64QAM in the first CQItable include: at least three entries in which modulation schemes are256QAM, where spectrum efficiencies in the at least three entries inwhich the modulation schemes are 256QAM are arranged in an arithmeticprogression or approximately in an arithmetic progression in ascendingorder of spectrum efficiency.

That spectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionin ascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are 256QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant.

That spectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged approximately in anarithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value.

That is, assuming that the spectrum efficiencies in the at least threeentries in which the modulation schemes are 256QAM are (m₁, m₂, . . . ,m_(Y)), where the subscript Y indicates spectrum efficiencies in Yentries in which modulation schemes are 256QAM, and Y≥3, starting from asecond entry of the Y entries, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is calculated and denoted as t_(j), where 1≤j≤Y−1 that is,(t₁, t₂, . . . , t_(Y−1)), and t_(j)=m_(j+1)m_(j).

If all values in (t₁, t₂, . . . , t_(Y−1)) are equal (are a constant),the spectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionin ascending order of spectrum efficiency, where the constant isreferred to as a common difference of the arithmetic progression.

If there is a constant enabling all absolute values of differencesbetween all the values in (t₁, t₂, . . . , t_(Y−1)) and the constant tobe within a preset value range, the spectrum efficiencies in the atleast three entries in which the modulation schemes are 256QAM arearranged approximately in an arithmetic progression in ascending orderof spectrum efficiency, which may also be understood as: if an absolutevalue of a difference between any two adjacent values in (t₁, t₂, . . ., t_(Y−1)) is less than a preset value, each value in (t₁, t₂, . . . ,t_(Y−1)) is approximately equal, and then, the spectrum efficiencies inthe at least three entries in which the modulation schemes are 256QAM ofthe entries in which the modulation schemes are higher than 64QAM in thefirst CQI table are arranged approximately in an arithmetic progressionin ascending order of spectrum efficiency, where the constant isreferred to as a common difference of the approximate arithmeticprogression.

Exemplarily, the entries in which the modulation schemes are 256QAM ofthe entries in which the modulation schemes are higher than 64QAM in thefirst CQI table are shown in Table 6.

TABLE 6 CQI index Modulation Code rate × 1024 Efficiency 12 256QAM 6965.4400 13 256QAM 778 6.0800 14 256QAM 860 6.7200 15 256QAM 942 7.3600

As shown in Table 6, spectrum efficiencies corresponding to the entriesin which the modulation schemes are 256QAM are 5.44, 6.08, 6.72, and7.36; starting from the second entry (that is, from the entry with theCQI index 13), a difference between a spectrum efficiency in each entryand a spectrum efficiency in a previous entry of the entry is equal to0.64, and then, the spectrum efficiencies corresponding to the entriesin which the modulation schemes are 256QAM in Table 6 are arranged in anarithmetic progression in ascending order of spectrum efficiency.

Exemplarily, the entries in which the modulation schemes are 256QAM ofthe entries in which the modulation schemes are higher than 64QAM in thefirst CQI table are shown in Table 7.

TABLE 7 CQI index Modulation Code rate × 1024 Efficiency 12 256QAM 6965.4375 13 256QAM 778 6.0781 14 256QAM 860 6.7188 15 256QAM 942 7.3594

As shown in Table 7, spectrum efficiencies corresponding to the entriesin which the modulation schemes are 256QAM are 5.4375, 6.0781, 6.7188,and 7.3594; starting from the second entry (that is, from the entry withthe CQI index 13), a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry isequal to 0.6406, 0.6407, and 0.6406 separately. Assuming that the presetvalue is 0.001, because an absolute value of a difference between 0.6407and 0.6406 is equal to 0.0001, which is less than 0.001, 0.6407 isapproximately equal to 0.6406, and then, the spectrum efficienciescorresponding to the entries in which the modulation schemes are 256QAMin Table 7 are arranged approximately in an arithmetic progression inascending order of spectrum efficiency.

Alternatively, as shown in Table 7, spectrum efficiencies correspondingto the entries in which the modulation schemes are 256QAM are 5.4375,6.0781, 6.7188, and 7.3594; assuming that the preset value is 0.001,starting from the second entry (that is, from the entry with the CQIindex 13), a difference between a spectrum efficiency in each entry anda spectrum efficiency in a previous entry is within a range from 0.64minus 0.001 to 0.64 plus 0.001, and then, the spectrum efficienciescorresponding to the entries in which the modulation schemes are 256QAMin Table 7 are arranged approximately in an arithmetic progression inascending order of spectrum efficiency.

Further, in the foregoing six types of first CQI tables, the first CQItable includes: at least three entries in which modulation schemes arehigher than 64QAM, where spectrum efficiencies in the at least threeentries in which the modulation schemes are higher than 64QAM arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency.

Specifically, that spectrum efficiencies in the at least three entriesin which the modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the atleast three entries in which the modulation schemes are higher than64QAM, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant.

That spectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

That is, assuming that the spectrum efficiencies in the at least threeentries in which the modulation schemes are higher than 64QAM are (m₁,m₂, . . . , m_(Z)), where the subscript Z indicates spectrumefficiencies in Z entries in which modulation schemes are higher than64QAM, and Z≥3, starting from a second entry of the Z entries, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is calculated and denoted ast_(k), where 1≤k≤Z−1, that is, (t₁, t₂, . . . , t_(z−1)), andt_(k)=m_(k+1)−m_(k).

If all values in (t₁, t₂, . . . , t_(z−1)) are equal (are a constant),the spectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged in an arithmeticprogression in ascending order of spectrum efficiency, where theconstant is referred to as a common difference of the arithmeticprogression.

If there is a constant enabling all absolute values of differencesbetween all the values in (t₁, t₂, . . . , t_(Z−1)) and the constant tobe within a preset value range, the spectrum efficiencies in the atleast three entries in which the modulation schemes are higher than64QAM are arranged approximately in an arithmetic progression inascending order of spectrum efficiency, which may also be understood as:if an absolute value of a difference between any two adjacent values in(t₁, t₂, . . . , t_(Z−1)) is less than a preset value, each value in(t₁, t₂, . . . , t_(Z−1)) is approximately equal, and then, the spectrumefficiencies in the at least three entries in which the modulationschemes are higher than 64QAM are arranged approximately in anarithmetic progression in ascending order of spectrum efficiency, wherethe constant is referred to as a common difference of the approximatearithmetic progression.

Exemplarily, entries in which modulation schemes are 256QAM of theentries in which the modulation schemes are higher than 64QAM in thefirst CQI table are shown in Table 8.

TABLE 8 CQI index Modulation Code rate × 1024 Efficiency 12 256QAM 6965.4400 13 256QAM 778 6.0800 14 256QAM 860 6.7200 15 256QAM 942 7.3600

As shown in Table 8, spectrum efficiencies corresponding to the entriesin which the modulation schemes are higher than 64QAM are 5.44, 6.08,6.72, and 7.36; starting from the second entry (that is, from the entrywith the CQI index 13), a difference between a spectrum efficiency ineach entry and a spectrum efficiency in a previous entry of the entry isequal to 0.64, and then, the spectrum efficiencies in the entries inwhich the modulation schemes are higher than 64QAM in Table 8 arearranged in an arithmetic progression in ascending order of spectrumefficiency.

Exemplarily, entries in which modulation schemes are 256QAM of theentries in which the modulation schemes are higher than 64QAM in thefirst CQI table are shown in Table 9.

TABLE 9 CQI index Modulation Code rate × 1024 Efficiency 12 256QAM 6965.4375 13 256QAM 778 6.0781 14 256QAM 860 6.7188 15 256QAM 942 7.3594

As shown in Table 9, spectrum efficiencies corresponding to the entriesin which the modulation schemes are higher than 64QAM are 5.4375,6.0781, 6.7188, and 7.3594; starting from the second entry (that is,from the entry with the CQI index 13), a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to 0.6406, 0.6407, and 0.6406 separately. Assumingthat the preset value is 0.001, because an absolute value of adifference between 0.6407 and 0.6406 is equal to 0.0001, which is lessthan 0.001, 0.6407 is approximately equal to 0.6406, and then, thespectrum efficiencies corresponding to the entries in which themodulation schemes are higher than 64QAM in Table 9 are arrangedapproximately in an arithmetic progression in ascending order ofspectrum efficiency.

Alternatively, as shown in Table 9, spectrum efficiencies correspondingto the entries in which the modulation schemes are higher than 64QAM are5.4375, 6.0781, 6.7188, and 7.3594; assuming that the preset value is0.001, starting from the second entry (that is, from the entry with theCQI index 13), a difference between a spectrum efficiency in each entryand a spectrum efficiency in a previous entry is within a range from0.64 minus 0.001 to 0.64 plus 0.001, and then, the spectrum efficienciescorresponding to the entries in which the modulation schemes are higherthan 64QAM in Table 9 are arranged approximately in an arithmeticprogression in ascending order of spectrum efficiency.

Further, the common difference of the arithmetic progression or thecommon difference of the approximate arithmetic progression is less thanor equal to a first threshold. The first threshold may be any presetthreshold, or may be a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or may be a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are the same and the modulation schemes arelower than or equal to 64QAM in the first CQI table, or may be a minimumvalue of an absolute value of a difference between spectrum efficienciesin any two adjacent entries in which modulation schemes are equal to64QAM in the first CQI table, or may be a minimum value of an absolutevalue of a difference between spectrum efficiencies in any two adjacententries in which modulation schemes are equal to 16QAM in the first CQItable, or may be a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are equal to QPSK in the first CQI table.

Exemplarily, the first CQI table in Table 3 is used as an example toobtain the following Table 10. A difference between spectrumefficiencies in adjacent entries in Table 10 is a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry starting from a second entry of modulationschemes with consecutive CQI indices (that is, from the entry with theCQI index 2 in the first CQI table).

TABLE 10 CQI index in CQI index in Difference between the first CQI thesecond Code spectrum efficiencies table CQI table Modulation rate × 1024Efficiency in adjacent entries 0 0 Out of range 1 2 QPSK 120 0.2344 — 25 QPSK 449 0.877 0.6426 3 7 16QAM 378 1.4766 0.5996 4 8 16QAM 490 1.91410.4375 5 9 16QAM 616 2.4063 0.4922 6 11 64QAM 567 3.3223 0.916 7 1264QAM 666 3.9023 0.58 8 13 64QAM 772 4.5234 0.6211 9 14 64QAM 873 5.11520.5918 10 15 256QAM 711 5.5547 0.4395 11 — 256QAM 757 5.9141 0.3594 12 —256QAM 803 6.2734 0.3594 13 — 256QAM 849 6.6328 0.3594 14 — 256QAM 8956.9922 0.3594 15 — 256QAM 941 7.3516 0.3594

As shown in Table 10, a minimum value of an absolute value of adifference between spectrum efficiencies corresponding to any twoadjacent entries in which modulation schemes are 256QAM is 0.3594, and aminimum value of an absolute value of a difference between spectrumefficiencies corresponding to any two adjacent entries in whichmodulation schemes are QPSK or 16QAM or 64QAM is 0.4375; therefore, inTable 10, the minimum value of the absolute value of the differencebetween the spectrum efficiencies corresponding to the any two adjacententries in which the modulation schemes are 256QAM is less than theminimum value of the absolute value of the difference between thespectrum efficiencies corresponding to the any two entries in which themodulation schemes are QPSK or 16QAM or 64QAM.

Further, in the foregoing six types of first CQI tables, an absolutevalue of a difference between spectrum efficiencies in any two adjacententries of X entries that are corresponding to maximum CQI indices andof the entries in which the modulation schemes are higher than 64QAM inthe first CQI table is less than or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table include: at least two entries in which modulationschemes are 256QAM, where an absolute value of a difference betweenspectrum efficiencies in any two adjacent entries of the at least twoentries in which the modulation schemes are 256QAM is less than or equalto a first threshold; or

the first CQI table includes: at least two entries in which modulationschemes are higher than 64QAM, where an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries of the atleast two entries in which the modulation schemes are higher than 64QAMis less than or equal to a first threshold.

Preferably, X=3.

The first threshold may be any preset threshold, or may be a minimumvalue of an absolute value of a difference between spectrum efficienciesin any two adjacent entries in which modulation schemes are lower thanor equal to 64QAM in the first CQI table, or may be a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are the same and themodulation schemes are lower than or equal to 64QAM in the first CQItable, or may be a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are equal to 64QAM in the first CQI table, or may bea minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to 16QAM in the first CQI table, or may be a minimum value of anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries in which modulation schemes are equal to QPSK in thefirst CQI table.

Exemplarily, the first CQI table in Table 3 is used as an example toobtain the following Table 11. A difference between spectrumefficiencies in adjacent entries in Table 11 is a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry starting from a second entry of modulationschemes with consecutive CQI indices (that is, from the entry with theCQI index 2 in the first CQI table).

TABLE 11 CQI index in CQI index in Difference between the first CQI thesecond Code spectrum efficiencies table CQI table Modulation rate × 1024Efficiency in adjacent entries 0 0 Out of range 1 2 QPSK 120 0.2344 — 25 QPSK 449 0.877 0.6426 3 7 16QAM 378 1.4766 0.5996 4 8 16QAM 490 1.91410.4375 5 9 16QAM 616 2.4063 0.4922 6 11 64QAM 567 3.3223 0.916 7 1264QAM 666 3.9023 0.58 8 13 64QAM 772 4.5234 0.6211 9 14 64QAM 873 5.11520.5918 10 15 256QAM 711 5.5547 0.4395 11 256QAM 757 5.9141 0.3594 12256QAM 803 6.2734 0.3594 13 — 256QAM 849 6.6328 0.3594 14 — 256QAM 8956.9922 0.3594 15 — 256QAM 941 7.3516 0.3594

As shown in Table 11, a minimum value of an absolute value of adifference between spectrum efficiencies corresponding to any twoadjacent entries in which modulation schemes are 256QAM is 0.3594, and aminimum value of an absolute value of a difference between spectrumefficiencies corresponding to any two adjacent entries in whichmodulation schemes are QPSK or 16QAM or 64QAM is 0.4375; therefore, inTable 11, the minimum value of the absolute value of the differencebetween the spectrum efficiencies corresponding to the any two adjacententries in which the modulation schemes are 256QAM is less than theminimum value of the absolute value of the difference between thespectrum efficiencies corresponding to the any two adjacent entries inwhich the modulation schemes are QPSK or 16QAM or 64QAM.

Further, it should be noted that the first CQI table is used fordescribing a mapping relationship between a CQI index and an entry. Inthis embodiment of the present invention, the mapping relationship inthe first CQI table is merely an example given for the convenience ofunderstanding the present invention, and a representation form of thefirst CQI table in the present invention includes, but is not limitedto, the example. That is, the first CQI table may have multiplecombinations, and the combinations shall fall within the protectionscope of the present invention as long as a mapping relationship betweena first CQI index and an entry can be reflected.

S102: The UE sends the first CQI index to a base station.

The present invention provides a notification method for a channelquality indicator and a modulation and coding scheme, which supports UEin selecting a modulation scheme higher than 64QAM and notifying a basestation by using a method of sending a CQI index, and meanwhile supportsthe base station in selecting a modulation scheme higher than 64QAM andnotifying the UE by using a method of sending an MCS index, therebyimproving system performance. Further, using the modulation schemehigher than 64QAM can provide higher quantization accuracy for an areawith a high signal-to-noise ratio, thereby improving the systemperformance.

The following describes in detail a notification method for an MCSprovided by an embodiment of the present invention with reference to theaccompanying drawings.

As shown in FIG. 2, steps of the notification method for an MCS are asfollows:

S201: A base station receives a first CQI index.

The first CQI index is determined by UE according to an acquired firstCQI table. The first CQI table in this embodiment may be any one of theforegoing first CQI tables in the foregoing embodiment, and details arenot described herein again.

S202: The base station determines a first MCS index according to a firstCQI table, a first MCS table, and the received first CQI index.

The first CQI table may be predefined in a protocol, for example, presetby the UE according to protocol specifications, or pre-stored by the UE;or may be selected by the UE from at least two predefined tablesaccording to a downlink channel state; or may be notified by the basestation to the UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table. A CQI table is used fordescribing a mapping relationship between a CQI index and an entry. Inthis embodiment of the present invention, the mapping relationship inthe CQI table is merely an example given for the convenience ofunderstanding the present invention, and a representation form of theCQI table in the present invention includes, but is not limited to, theexample. That is, the CQI table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between a CQI index and anentry can be reflected.

The first MCS table may be predefined in a protocol, for example, presetby the UE according to protocol specifications, or pre-stored by the UE;or may be selected by the UE from at least two predefined tablesaccording to a downlink channel state; or may be notified by the basestation to the UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table. An MCS table is usedfor describing a mapping relationship between an MCS index and an entry.In this embodiment of the present invention, the mapping relationship inthe MCS table is merely an example given for the convenience ofunderstanding the present invention, and a representation form of theMCS table in the present invention includes, but is not limited to, theexample. That is, the MCS table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between an MCS index and anentry can be reflected.

The first CQI table may include:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second CQI table, and the first combination is N entries withconsecutive maximum CQI indices corresponding to QPSK in the second CQItable, where N is equal to 3 or N is a positive integer less than 4 or Nis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second CQI table, where

modulation schemes in the second CQI table include only QPSK, 16QAM, and64QAM.

That is, the first CQI table includes the entries in which themodulation schemes are higher than 64QAM; the first CQI table furtherincludes the at least one entry in which the modulation scheme is QPSKin the second CQI table, and entries in which modulation schemes areQPSK in the first CQI table cannot only be the N entries that arecorresponding to the consecutive maximum CQI indices and of the entriesin which the modulation schemes are QPSK in the second CQI table, whereN is equal to 3 or N is a positive integer less than 4 or N is apositive integer; and/or the first CQI table further includes the atleast one entry in which the modulation scheme is 16QAM in the secondCQI table, where modulation schemes in entries in the second CQI tableinclude only QPSK, 16QAM, and 64QAM. An entry in the first CQI tablerefers to one modulation scheme, one code rate, and one spectrumefficiency that correspond to each CQI index in the first CQI table; anentry in the second CQI table refers to one modulation scheme, one coderate, and one spectrum efficiency that correspond to each CQI index inthe second CQI table.

The first MCS table may include:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a second combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the second combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

That is, the first MCS table further includes the at least one entry inwhich the modulation scheme is QPSK in the second MCS table; entries inwhich modulation schemes are QPSK in the first MCS table cannot only bethe K entries that are corresponding to the consecutive maximum MCSindices and of the entries in which the modulation schemes are QPSK inthe second MCS table indices, where K is equal to 4 or K is a positiveinteger less than 5 or K is a positive integer; and/or the first MCStable further includes the at least one entry in which the modulationscheme is 16QAM in the second MCS table, where modulation schemes inentries in the second MCS table include only QPSK, 16QAM, and 64QAM. Anentry in the first MCS table refers to one modulation scheme and one TBSindex that correspond to each MCS index in the first MCS table, and anentry in the second MCS table refers to one modulation scheme and oneTBS index that correspond to each MCS index in the second MCS table.

The combination is a combination formed by the at least one entry inwhich the modulation scheme is QPSK in the second MCS table. Using asecond MCS table shown in Table 14 as an example, there are in total2¹⁰−1=1023 combinations formed by at least one entry in which amodulation scheme is QPSK in the second MCS table. For example, thecombination may be a combination formed by an entry corresponding to aMCS index 6 in the second MCS table, may be a combination formed byentries corresponding to MCS indices 6, 7, 8, and 9 in the second MCStable, may be a combination formed by entries corresponding to MCSindices 3, 6, 7, 8, and 9 in the second MCS table, or the like.

Specifically, there may be three types of first MCS tables:

a first type of first MCS table: including only entries in whichmodulation schemes are QPSK and entries in which modulation schemes arehigher than 64QAM;

a second type of first MCS table: including only entries in whichmodulation schemes are 16QAM and entries in which modulation schemes arehigher than 64QAM; and

a third type of first MCS table: including only entries in whichmodulation schemes are QPSK, entries in which modulation schemes are16QAM, and entries in which modulation schemes are higher than 64QAM.

There may be multiple types of first MCS tables in the presentinvention, and the foregoing three types of first MCS tables are merelyexamples given for ease of understanding the present invention, and thepresent invention includes, but is not limited to, the examples.

Specifically, the determining a first MCS index according to an acquiredfirst CQI table, an acquired first MCS table, and the received first CQIindex includes:

determining a first TBS index and the first MCS index according to anacquired first PRB quantity, the first CQI table, the first MCS table,and the received first CQI index.

The first PRB quantity is a PRB quantity allocated by the base stationto the UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient, where the specific coefficient is a pre-stored value or isa value notified by the base station to the UE.

Specifically, when a first modulation scheme is 256QAM and the PRBquantity allocated to the UE is less than or equal to a specificthreshold Q, the first PRB quantity is a maximum integer not greaterthan a product of the PRB quantity allocated to the UE and a specificcoefficient P. A product of P and Q is not greater than a maximum PRBquantity, and in an LTE system, the maximum PRB quantity is 110.Preferably, when Q=82, and P=1.33, where P×Q=109.06<110, if the PRBquantity allocated by the base station to the UE is 50, the first PRBquantity is a maximum integer less than or equal to 50*1.33=66.5, thatis, the first PRB quantity is 66.

A first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table.

A value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26; or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

Further specifically, the determining a first TBS index according to thefirst CQI table, a first PRB quantity, a first MCS table, and thereceived first CQI index includes:

first, determining, according to the received first CQI index and thefirst CQI table, a first modulation scheme and a first spectrumefficiency that correspond to the received first CQI index;

second, learning, according to the first PRB quantity and the firstspectrum efficiency, a first transport block size transmitted to the UE;and

then obtaining, according to the first TBS table, the first TBS indexthat corresponds to the first transport block size and the first PRBquantity in the first TBS table.

It should be noted that the first CQI table, the first MCS table, andthe first TBS table may be pre-stored by the base station.

For the convenience of understanding, a TBS table in an existingprotocol (that is, the second TBS table) is shown as follows:

TABLE 12 Second TBS PRB quantity index 1 2 3 4 . . . 106 107 108 109 1100 16 32 56 88 . . . 2984 2984 2984 2984 3112 1 24 56 88 144 . . . 38803880 4008 4008 4008 2 32 72 144 176 . . . 4776 4776 4776 4968 4968 3 40104 176 208 . . . 6200 6200 6200 6456 6456 4 56 120 208 256 . . . 74807736 7736 7736 7992 5 72 144 224 328 . . . 9528 9528 9528 9528 9528 6328 176 256 392 . . . 11064 11064 11448 11448 11448 7 104 224 328 472 .. . 12960 12960 12960 13536 13536 8 120 256 392 536 . . . 14688 1526415264 15264 15264 9 136 296 456 616 . . . 16992 16992 16992 16992 1756810 144 328 504 680 . . . 18336 19080 19080 19080 19080 11 176 376 584776 . . . 21384 21384 22152 22152 22152 12 208 440 680 904 . . . 2449624496 24496 24496 25456 13 224 488 744 1000 . . . 27376 27376 2737628336 28336 14 256 552 840 1128 . . . 30576 30576 30576 31704 31704 15280 600 904 1224 . . . 32856 32856 32856 34008 34008 16 328 632 968 1288. . . 34008 35160 35160 35160 35160 17 336 696 1064 1416 . . . 3788839232 39232 39232 39232 18 376 776 1160 1544 . . . 42368 42368 4236843816 43816 19 408 840 1288 1736 . . . 45352 46888 46888 46888 46888 20440 904 1384 1864 . . . 48936 48936 51024 51024 51024 21 488 1000 14801992 . . . 52752 52752 55056 55056 55056 22 520 1064 1608 2152 . . .57336 57336 59256 59256 59256 23 552 1128 1736 2280 . . . 61664 6166461664 61664 63776 24 584 1192 1800 2408 . . . 63776 66592 66592 6659266592 25 616 1256 1864 2536 . . . 66592 68808 68808 68808 71112 26 7121480 2216 2984 . . . 75376 75376 75376 75376 75376

Exemplarily, when B=32, a range of the first TBS index is 0 to 32 (asshown in Table 13) in the first TBS table, where xxx shown in Table 13indicates a transport block size, and a specific value may be setaccording to a simulation result.

TABLE 13 First TBS PRB quantity index 1 2 3 4 . . . 106 107 108 109 1100 16 32 56 88 . . . 2984 2984 2984 2984 3112 1 24 56 88 144 . . . 38803880 4008 4008 4008 2 32 72 144 176 . . . 4776 4776 4776 4968 4968 3 40104 176 208 . . . 6200 6200 6200 6456 6456 4 56 120 208 256 . . . 74807736 7736 7736 7992 5 72 144 224 328 . . . 9528 9528 9528 9528 9528 6328 176 256 392 . . . 11064 11064 11448 11448 11448 7 104 224 328 472 .. . 12960 12960 12960 13536 13536 8 120 256 392 536 . . . 14688 1526415264 15264 15264 9 136 296 456 616 . . . 16992 16992 16992 16992 1756810 144 328 504 680 . . . 18336 19080 19080 19080 19080 11 176 376 584776 . . . 21384 21384 22152 22152 22152 12 208 440 680 904 . . . 2449624496 24496 24496 25456 13 224 488 744 1000 . . . 27376 27376 2737628336 28336 14 256 552 840 1128 . . . 30576 30576 30576 31704 31704 15280 600 904 1224 . . . 32856 32856 32856 34008 34008 16 328 632 968 1288. . . 34008 35160 35160 35160 35160 17 336 696 1064 1416 . . . 3788839232 39232 39232 39232 18 376 776 1160 1544 . . . 42368 42368 4236843816 43816 19 408 840 1288 1736 . . . 45352 46888 46888 46888 46888 20440 904 1384 1864 . . . 48936 48936 51024 51024 51024 21 488 1000 14801992 . . . 52752 52752 55056 55056 55056 22 520 1064 1608 2152 . . .57336 57336 59256 59256 59256 23 552 1128 1736 2280 . . . 61664 6166461664 61664 63776 24 584 1192 1800 2408 . . . 63776 66592 66592 6659266592 25 616 1256 1864 2536 . . . 66592 68808 68808 68808 71112 26 7121480 2216 2984 . . . 75376 75376 75376 75376 75376 27 xxx xxx xxx xxxxxx xxx xxx xxx xxx xxx 28 xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 29xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 30 xxx xxx xxx xxx xxx xxx xxxxxx xxx xxx 31 xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 32 xxx xxx xxxxxx xxx xxx xxx xxx xxx xxx

Finally, the first MCS index corresponding to the first TBS index islearned according to the first MCS table, the first modulation scheme,and the first TBS index.

The first CQI table in this embodiment may be the same as the first CQItable in the foregoing embodiment, and details are not described hereinagain. The following describes the first MCS table in this embodiment indetail.

For the convenience of understanding, the following MCS table (that is,the second MCS table) is used an example for description.

TABLE 14 MCS index in the second TBS index in the second MCS tableModulation order MCS table 0 2 0 1 2 1 2 2 2 3 2 3 4 2 4 5 2 5 6 2 6 7 27 8 2 8 9 2 9 10 4 9 11 4 10 12 4 11 13 4 12 14 4 13 15 4 14 16 4 15 176 15 18 6 16 19 6 17 20 6 18 21 6 19 22 6 20 23 6 21 24 6 22 25 6 23 266 24 27 6 25 28 6 26 29 2 Reserved 30 4 31 6

In Table 14, a modulation order corresponds to a modulation scheme.Exemplarily, if a modulation scheme is QPSK, a modulation order is 2; ifa modulation scheme is 16QAM, a modulation order is 4; if a modulationscheme is 64QAM, a modulation order is 6; if a modulation scheme is256QAM, a modulation order is 8.

In Table 14, entries with MCS indices 29, 30, and 31 are reservedentries.

It should be noted that, in order to reduce a change to the prior art ina specific implementation process, preferably, a range of an MCS indexin the first MCS table and a range of an MCS index in the second MCStable may be the same, which is 0 to 31. Certainly, the range of an MCSindex in the first MCS table may also be greater than the range of anMCS index in the second MCS table, and exemplarily, the range of an MCSindex in the first MCS table is 0 to 40.

For the first type of first MCS table, the first type of first MCS tableincludes only the entries in which the modulation schemes are QPSK andthe entries in which the modulation schemes are higher than 64QAM.

A quantity of entries in which the modulation schemes are higher than64QAM and that are included in the first MCS table may be one or more,and each entry in which the modulation scheme is higher than 64QAMincludes a modulation order and a first TBS index, and has acorresponding MCS index.

TABLE 15 MCS index in the second TBS index in the second MCS tableModulation order MCS table 21 8 26 22 8 27 23 8 28

The first MCS table further includes the at least one entry in which themodulation scheme is QPSK in the second MCS table, where the at leastone entry in which the modulation scheme is QPSK includes thecombination except the second combination of the combinations formed bythe at least one entry in which the modulation scheme is QPSK in thesecond MCS table. That is, the first MCS table further includes the atleast one entry in which the modulation scheme is QPSK in the second MCStable, and MCS indices, corresponding to the entries in which themodulation schemes are QPSK, in the first MCS table are not the Kentries that are corresponding to the consecutive maximum MCS indices ofthe entries in which the modulation schemes are QPSK in the second MCStable, where K is 6. That is, some entries of 9 entries in whichmodulation schemes are QPSK and that correspond to indices 0 to 9 in thesecond MCS table (that is, in Table 14) are included, and the entries inwhich the modulation schemes are QPSK in the first MCS table are not 6entries with consecutive maximum MCS indices of the entries in which themodulation schemes are QPSK in the second MCS table.

That is, the entries in which the modulation schemes are QPSK in thefirst MCS table cannot only be the entries corresponding to the MCSindices 4, 5, 6, 7, 8, and 9 in the second MCS table.

Alternatively, the first MCS table further includes the at least oneentry in which the modulation scheme is QPSK in the second MCS table,where MCS indices, corresponding to the entries in which the modulationschemes are QPSK, in the second MCS table are not entries correspondingto K consecutive maximum MCS indices, where K is a positive integer.That is, some entries of 9 entries in which modulation schemes are QPSKand that correspond to MCS indices 0 to 9 in the second MCS table areincluded, and the entries in which the modulation schemes are QPSK inthe first MCS table are not the K entries with the consecutive maximumMCS indices of the entries in which the modulation schemes are QPSK inthe second MCS table, where specifically, a value range of K may be 1 to8, that is:

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entry corresponding to the MCS index 9 in thesecond MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 8 and9 in the second MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 7, 8and 9 in the second MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 6, 7,8 and 9 in the second MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 5, 6,7, 8 and 9 in the second MCS table;

or the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 4, 5,6, 7, 8 and 9 in the second MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 3, 4,5, 6, 7, 8 and 9 in the second MCS table; or

the entries in which the modulation schemes are QPSK in the first MCStable cannot only be the entries corresponding to the MCS indices 2, 3,4, 5, 6, 7, 8, and 9 in the second MCS table.

Alternatively, the first MCS table includes some entries in whichmodulation schemes are QPSK in the second MCS table, where MCS indicescorresponding to the some entries are at equal intervals.

Exemplarily, if the entries in which the modulation schemes are QPSK inthe first MCS table include 3 entries in which modulation schemes areQPSK in the second MCS table, the entries in which the modulationschemes are QPSK in the first MCS table may include the entriescorresponding to the MCS indices 0, 3, and 6 in the second MCS table, orthe entries in which the modulation schemes are QPSK in the first MCStable may include the entries corresponding to the CQI indices 2, 5, and8 in the second MCS table, or the entries in which the modulationschemes are QPSK in the first MCS table may include the entriescorresponding to the CQI indices 3, 6, and 9 in the second MCS table, orthe entries in which the modulation schemes are QPSK in the first MCStable may include the entries corresponding to the CQI indices 0, 4, and8 in the second MCS table, or the entries in which the modulationschemes are QPSK in the first MCS table may include the entriescorresponding to the CQI indices 1, 5, and 9 in the second MCS table;

if the entries in which the modulation schemes are QPSK in the first MCStable include 4 entries in which modulation schemes are QPSK in thesecond MCS table, the entries in which the modulation schemes are QPSKin the first MCS table may include the entries corresponding to the MCSindices 0, 3, 6, and 9 in the second MCS table; or

if the entries in which the modulation schemes are QPSK in the first MCStable include 5 entries in which modulation schemes are QPSK in thesecond MCS table, the entries in which the modulation schemes are QPSKin the first MCS table may include the entries corresponding to the MCSindices 1, 3, 5, 7, and 9 in the second MCS table, or the entries inwhich the modulation schemes are QPSK in the first MCS table may includethe entries corresponding to the MCS indices 0, 2, 4, 6, and 8 in thesecond MCS table.

Alternatively, the first MCS table includes some entries in whichmodulation schemes are QPSK in the second MCS table, where MCS indicescorresponding to the some entries are not at equal intervals.

Exemplarily, the entries in which the modulation schemes are QPSK in thefirst MCS table include M entries in which modulation schemes are QPSKin the second MCS table, where a value of M may be 3, 4, 5, 6, 7, 8 or9. If M=5, the entries in which the modulation schemes are QPSK in thefirst MCS table include 5 entries in which modulation schemes are QPSKin the MCS table, and in this case, the entries in which the modulationschemes are QPSK in the first MCS table may include the entriescorresponding to the MCS indices 1, 4, 7, 8, and 9 in the second MCStable.

Alternatively, the first MCS table includes some entries in whichmodulation schemes are QPSK in the second MCS table, and at least oneentry, except an entry with a maximum MCS index, of all entries in whichmodulation schemes are QPSK in the second MCS table, where MCS indicescorresponding to the some entries are inconsecutive. That is, the someentries in which the modulation schemes are QPSK in the second MCS tableand that are included in the first MCS table do not include the entrywith the maximum MCS index of all the entries in which the modulationschemes are QPSK in the second MCS table.

Exemplarily, the entries in which the modulation schemes are QPSK in thefirst MCS table include M entries in which modulation schemes are QPSKin the second MCS table, where a value of M may be 1, 2, 3, 4, 5, 6, 7,8, or 9. If M=8, the entries in which the modulation schemes are QPSK inthe first MCS table include 8 entries in which modulation schemes areQPSK in the second MCS table, and in this case, the entries in which themodulation schemes are QPSK in the first MCS table may include theentries corresponding to the MCS indices 0, 1, 2, 3, 4, 5, 6, and 8 inthe second MCS table.

Alternatively, the first MCS table includes some entries in whichmodulation schemes are QPSK in the second MCS table, and at least oneentry, except an entry with a maximum MCS index, of all entries in whichmodulation schemes are QPSK in the second MCS table, where MCS indicescorresponding to the some entries are consecutive. That is, the someentries in which the modulation schemes are QPSK in the second MCS tableand that are included in the first MCS table do not include the entrywith the maximum MCS index of all the entries in which the modulationschemes are QPSK in the second MCS table.

Exemplarily, the entries in which the modulation schemes are QPSK in thefirst MCS table include M entries in which modulation schemes are QPSKin the second MCS table, where a value of M may be 1, 2, 3, 4, 5, 6, 7,8, or 9. If M=8, the entries in which the modulation schemes are QPSK inthe first MCS table include 8 entries in which modulation schemes areQPSK in the second MCS table, and in this case, the entries in which themodulation schemes are QPSK in the first MCS table may include theentries corresponding to the MCS indices 0, 1, 2, 3, 4, 5, 6, and 7 inthe second MCS table.

For the second type of first MCS table, the second type of first MCStable includes only the entries in which the modulation schemes are16QAM and the entries in which the modulation schemes are higher than64QAM.

A quantity of entries in which the modulation schemes are higher than64QAM and that are included in the first MCS table may be one or more,and each entry in which the modulation scheme is higher than 64QAMincludes a modulation order and a first TBS index, and has acorresponding MCS index.

The first MCS table further includes the at least one entry in which themodulation scheme is 16QAM in the second MCS table.

Specifically, the first MCS table further includes all entries in whichmodulation schemes are 16QAM in the second MCS table.

Exemplarily, the first MCS table further includes 6 entries in whichcorresponding modulation schemes are 16QAM and that correspond to MCSindices 10 to 16, of the entries in which the modulation schemes are16QAM in the second MCS table.

Alternatively, the first MCS table further includes some entries inwhich modulation schemes are 16QAM in the second MCS table, where MCSindices corresponding to the some entries are at equal intervals.

Exemplarily, if the entries in which the modulation schemes are 16QAM inthe first MCS table include 3 entries in which modulation schemes are16QAM in the second MCS table, the entries in which the modulationschemes are 16QAM in the first MCS table may include entriescorresponding to MCS indices 10, 13, and 16 in the second MCS table, orthe entries in which the modulation schemes are 16QAM in the first MCStable may include entries corresponding to MCS indices 10, 12, and 14 inthe second MCS table, or the entries in which the modulation schemes are16QAM in the first MCS table may include entries corresponding to MCSindices 11, 13, and 15 in the second MCS table, or the entries in whichthe modulation schemes are 16QAM in the first MCS table may includeentries corresponding to MCS indices 12, 14, and 16 in the second MCStable; or

if the entries in which the modulation schemes are 16QAM in the firstMCS table include 4 entries in which modulation schemes are 16QAM in thesecond MCS table, the entries in which the modulation schemes are 16QAMin the first MCS table may include entries corresponding to MCS indices10, 12, 14, and 16 in the second MCS table.

Alternatively, the first MCS table further includes entries in whichmodulation schemes are 16QAM in the second MCS table, where MCS indicescorresponding to the some entries are not at equal intervals.

Exemplarily, the entries in which the modulation schemes are 16QAM inthe first MCS table include M entries in which modulation schemes are16QAM in the second MCS table, where a value of M may be 3, 4, 5, and 6.If M=5, the some entries in which the modulation schemes are 16QAM inthe first MCS table may include entries corresponding to MCS indices 10,12, 14, 15, and 16 in the second MCS table.

Alternatively, the first MCS table further includes some entries inwhich modulation schemes are 16QAM in the second MCS table, and at leastone entry, except an entry with a maximum second MCS index, of allentries in which modulation schemes are 16QAM in the second MCS table,where MCS indices corresponding to the some entries are inconsecutive.That is, the first MCS table further includes the some entries in whichthe modulation schemes are 16QAM in the second MCS table, where the MCSindices corresponding to the some entries are inconsecutive, and thesome entries do not include the entry with the maximum MCS index of allthe entries in which the modulation schemes are 16QAM in the second MCStable.

Exemplarily, the entries in which the modulation schemes are 16QAM inthe first MCS table include M entries in which modulation schemes are16QAM in the second MCS table, where a value of M may be 1, 2, 3, 4, 5,or 6. If M=5, the entries in which the modulation schemes are 16QAM inthe first MCS table may include entries corresponding to MCS indices 10,11, 12, 13, and 15 in the second MCS table.

Alternatively, the first MCS table further includes some entries inwhich modulation schemes are 16QAM in the second MCS table, and at leastone entry, except an entry with a maximum MCS index, of all entries inwhich modulation schemes are 16QAM in the second MCS table, where MCSindices corresponding to the some entries are consecutive. That is, thefirst MCS table further includes the some entries in which themodulation schemes are 16QAM in the second MCS table, and the someentries do not include the entry with the maximum MCS index of all theentries in which the modulation schemes are 16QAM in the second MCStable.

Exemplarily, the entries in which the modulation schemes are 16QAM inthe first MCS table include M entries in which modulation schemes are16QAM in the second MCS table, where a value of M may be 1, 2, 3, 4, 5,or 6. If M=6, the entries in which the modulation schemes are 16QAM inthe first MCS table may include entries corresponding to MCS indices 10,11, 12, 13, 14, and 15 in the second MCS table.

Alternatively, the first MCS table further includes some entries inwhich modulation schemes are 16QAM in the second MCS table, and at leastone entry, except an entry with a maximum MCS index and an entry with aminimum MCS index, of all entries in which modulation schemes are 16QAMin the second MCS table. That is, the first MCS table further includesthe some entries in which the modulation schemes are 16QAM in the secondMCS table, and the some entries do not include the entry with themaximum MCS index and the entry with the minimum MCS index of all theentries in which the modulation schemes are 16QAM in the second MCStable.

Exemplarily, the entries in which the modulation schemes are 16QAM inthe first MCS table include M entries in which modulation schemes are16QAM in the second MCS table, where a value of M may be 1, 2, 3, 4, or5. If M=5, the entries in which the modulation schemes are 16QAM in thefirst MCS table may include entries corresponding to MCS indices 11, 12,13, 14, and 15 in the second MCS table; or

if M=4, the entries in which the modulation schemes are 16QAM in thefirst MCS table may include entries corresponding to MCS indices 11, 12,13, and 14 in the second MCS table, or the entries in which themodulation schemes are 16QAM in the first MCS table may include entriescorresponding to MCS indices 11, 13, 14, and 15 in the second MCS table.

For the third type of first MCS table, based on the first type of firstMCS table, entries in which modulation schemes are 16QAM are added toobtain the third type of first MCS table. The third type of first MCStable includes only the entries in which the modulation schemes areQPSK, the entries in which modulation schemes are 16QAM, and the entriesin which the modulation schemes are higher than 64QAM. Specifically, anentry in which a modulation scheme is 16QAM and that is included in thethird type of first MCS table may be the same as an entry in which amodulation scheme in the modulation schemes included in the second typeof first MCS table is 16QAM, reference may be made to description of anentry in which a modulation scheme is 16QAM in the second type of firstMCS table, and details are not described herein again.

Further, the first MCS table further includes at least one entry inwhich a modulation scheme is 64QAM in the second MCS table.

That is, based on the first type of first MCS table, a table to whichentries in which modulation schemes are 64QAM are added is a fourth typeof first MCS table; in this case, the fourth type of first MCS tableincludes entries in which modulation schemes are QPSK, entries in whichmodulation schemes are higher than 64QAM, and entries in whichmodulation schemes are 16QAM.

Alternatively, based on the second type of first MCS table, a table towhich entries in which modulation schemes are 64QAM are added is a fifthtype of first MCS table; in this case, the fifth type of first MCS tableincludes entries in which modulation schemes are 16QAM, entries in whichmodulation schemes are higher than 64QAM, and entries in whichmodulation schemes are 64QAM.

Alternatively, based on the third type of first MCS table, a table towhich entries in which modulation schemes are 64QAM are added is a sixthtype of first MCS table; in this case, the sixth type of first MCS tableincludes entries in which modulation schemes are QPSK, entries in whichmodulation schemes are 16QAM, entries in which modulation schemes arehigher than 64QAM, and entries in which modulation schemes are 64QAM.

The entries in which the modulation schemes are 64QAM in the fourth,fifth, and sixth types of first MCS tables are as follows:

Specifically, the first MCS table further includes all entries in whichmodulation schemes are 64QAM in the second MCS table.

Exemplarily, the first MCS table further includes 12 entries in whichcorresponding modulation schemes are 16QAM and that correspond to MCSindices 17 to 28, of the entries in which the modulation schemes are16QAM in the second MCS table.

Alternatively, the first MCS table further includes some entries inwhich modulation schemes are 64QAM in the second MCS table, and at leastone entry, except an entry with a minimum MCS index, of all entries inwhich modulation schemes are 64QAM in the second MCS table. That is, thesome entries in which the modulation schemes are 64QAM in the second MCStable are included, and the some entries do not include the entry withthe minimum MCS index of all the entries in which the modulation schemesare 64QAM in the second MCS table.

Exemplarily, the first MCS table further includes M entries in whichmodulation schemes are 64QAM in the second MCS table, where a valuerange of M is 1 to 11, and M is an integer. If M=5, the entries in whichthe modulation schemes are 64QAM in the first MCS table may includeentries corresponding to MCS indices 18, 19, 20, 21, and 23 in thesecond MCS table, or the entries in which the modulation schemes are64QAM in the first MCS table may include entries corresponding to MCSindices 18, 20, 21, 24, and 25 in the second MCS table; or

if M=7, the entries in which the modulation schemes are 64QAM in thefirst MCS table may include entries corresponding to MCS indices 18, 19,20, 21, 23, 25, and 26 in the second MCS table, or the entries in whichthe modulation schemes are 64QAM in the first MCS table may includeentries corresponding to MCS indices 19, 20, 21, 24, 25, 27, and 28 inthe second MCS table.

Further, in the foregoing six types of first MCS tables, a TBS index inan entry that is corresponding to a minimum MCS index and of all entriesin which modulation schemes are higher than 64QAM in the first MCS tableis the same as a TBS index in an entry with a maximum MCS index of allthe entries in which the modulation schemes are 64QAM in the second MCStable.

Exemplarily, assume that in the first MCS table, there are 5 entries inwhich modulation schemes are QPSK, and corresponding MCS indices are 0to 4; there are 5 entries in which modulation schemes are 16QAM, andcorresponding MCS indices are 5 to 9; there are 11 entries in whichmodulation schemes are 64QAM, and corresponding MCS indices are 10 to20; and a range of an MCS index in the first MCS table is 0 to 31, wherethere are 7 entries (including 3 reserved entries, and MCS indicescorresponding to the entries are 28, 29, 30, and 31) in which modulationschemes are higher than 64QAM in the first MCS table, corresponding MCSindices are 21 to 28, and an entry with a minimum index is 21. Thenspecifically, as shown in the following Table 16, a TBS index in anentry with the MCS index 21 in the first MCS table is 26, which is equalto a TBS index in an entry corresponding to the MCS index 28 in thesecond MCS table shown in Table 14.

TABLE 16 MCS index in the first MCS index in the Modulation TBS index inthe first MCS table second MCS table order MCS table 0 0 2 0 1 2 2 2 2 42 4 3 6 2 6 4 8 2 8 5 10 4 9 6 12 4 11 7 14 4 13 8 15 4 14 9 16 4 15 1018 6 16 11 19 6 17 12 20 6 18 13 21 6 19 14 22 6 20 15 23 6 21 16 24 622 17 25 6 23 18 26 6 24 19 27 6 25 20 28 6 26 21 — 8 26 22 — 8 27 23 —8 28 24 — 8 29 25 — 8 30 26 — 8 31 27 — 8 32 28 29 2 Reserved 29 30 4 3031 6 31 8

As can be seen, the foregoing six types of first MCS tables all includean entry in which a modulation scheme is higher than 64QAM, so as tosupport the base station in selecting a modulation scheme higher than64QAM and notifying the UE by using a method of sending an MCS index,thereby improving system performance. In addition, the sixth type offirst MCS table that includes entries in which modulation schemes areQPSK, 16QAM, and 64QAM and entries in which modulation schemes arehigher than 64QAM is a preferred first MCS table.

S203: The base station sends the determined first MCS index to UE.

The present invention provides a notification method for a channelquality indicator and a modulation and coding scheme, which supports UEin selecting a modulation scheme higher than 64QAM and notifying a basestation by using a method of sending a CQI index, and meanwhile supportsthe base station in selecting a modulation scheme higher than 64QAM andnotifying the UE by using a method of sending an MCS index, therebyimproving system performance. Further, using the modulation schemehigher than 64QAM can provide higher quantization accuracy for an areawith a high signal-to-noise ratio, thereby improving the systemperformance.

As shown in FIG. 3, the present invention further provides anothernotification method for an MCS. The method includes the following steps:

A first CQI table in this embodiment may be the same as or may bedifferent from any one of the first CQI tables in the foregoingembodiment; however, a common point of the two is that an entry in whicha modulation scheme is higher than 64QAM is included. A first MCS tablein this embodiment may be any one of the MCS tables in the foregoingembodiment.

The first CQI table may be predefined in a protocol, and preset by UEaccording to protocol specifications, or pre-stored by the UE; or may beselected by UE from at least two predefined tables according to adownlink channel state; or may be notified by a base station to UE, andspecifically, a method for notifying the UE by the base station may bethat the base station selects one of at least two predefined tablesaccording to an uplink channel state or a downlink channel state, andnotifies the UE of the table. A CQI table is used for describing amapping relationship between a CQI index and an entry. In thisembodiment of the present invention, the mapping relationship in the CQItable is merely an example given for the convenience of understandingthe present invention, and a representation form of the CQI table in thepresent invention includes, but is not limited to, the example. That is,the CQI table may have multiple combinations, and the combinations shallfall within the protection scope of the present invention as long as amapping relationship between a CQI index and an entry can be reflected.

The first MCS table may be predefined in a protocol, for example, presetby the UE according to protocol specifications, or pre-stored by the UE;or may be selected by the UE from at least two predefined tablesaccording to a downlink channel state; or may be notified by the basestation to the UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table. An MCS table is usedfor describing a mapping relationship between an MCS index and an entry.In this embodiment of the present invention, the mapping relationship inthe MCS table is merely an example given for the convenience ofunderstanding the present invention, and a representation form of theMCS table in the present invention includes, but is not limited to, theexample. That is, the MCS table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between an MCS index and anentry can be reflected.

S301: A base station receives a first CQI index.

The first CQI index is determined by the base station according to anacquired first CQI table.

S302: The base station determines a first MCS index according to a firstCQI table, a first MCS table, and the received first CQI index.

The first CQI table includes: entries in which modulation schemes arehigher than 64QAM, where an entry in the first CQI table refers to onemodulation scheme, one code rate, and one spectrum efficiency thatcorrespond to each CQI index in the first CQI table.

The first MCS table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

That is, the first MCS table includes the entries in which themodulation schemes are higher than 64QAM; and the first MCS tablefurther includes the at least one entry in which the modulation schemeis QPSK in the second MCS table, and MCS indices, corresponding toentries in which modulation schemes are QPSK, in the second MCS tablecannot only be entries corresponding to K consecutive maximum MCSindices, where K is equal to 4 or K is a positive integer less than 5 orK is a positive integer; and/or the first MCS table further includes theat least one entry in which the modulation scheme is 16QAM in the secondMCS table. Modulation schemes in entries in the second MCS table includeonly QPSK, 16QAM, and 64QAM. An entry in the first MCS table refers toone modulation scheme and one TBS index that correspond to each MCSindex in the first MCS table, and an entry in the second MCS tablerefers to one modulation scheme and one TBS index that correspond toeach MCS index in the second MCS table.

The combination is a combination formed by the at least one entry inwhich the modulation scheme is QPSK in the second MCS table. Using thesecond MCS table shown in Table 6 as an example, there are in total2¹⁰-1=1023 combinations formed by the at least one entry in which themodulation scheme is QPSK in the second MCS table. For example, thecombination may be a combination formed by an entry corresponding to aCQI index 6 in the second MCS table, may be a combination formed byentries corresponding to MCS indices 6, 7, 8, and 9 in the second MCStable, may be a combination formed by entries corresponding to CQIindices 3, 6, 7, 8, and 9 in the second CQI table, or the like.

It should be noted that a method for determining, by the base station, afirst MCS index according to the received first CQI index, a first CQItable, and a first MCS table is the same as the method described in theforegoing embodiment, and details are not described herein again.

In addition, the first MCS table in this embodiment may be any one ofthe six types of first MCS tables in the foregoing embodiment, anddetails are not described herein again.

S303: The base station sends the determined first MCS index to UE.

The present invention provides a notification method for a channelquality indicator and a modulation and coding scheme, which supports UEin selecting a modulation scheme higher than 64QAM and notifying a basestation by using a method of sending a CQI index, and meanwhile supportsthe base station in selecting a modulation scheme higher than 64QAM andnotifying the UE by using a method of sending an MCS index, therebyimproving system performance. Further, using the modulation schemehigher than 64QAM can provide higher quantization accuracy for an areawith a high signal-to-noise ratio, thereby improving the systemperformance.

As shown in FIG. 4, the present invention further provides anothernotification method for an MCS. A first MCS table in this embodiment maybe any one of the first MCS tables in the foregoing embodiment.

In this embodiment, the first MCS table may be predefined in a protocol,and preset by UE according to protocol specifications, or pre-stored byUE; or may be selected by UE from at least two predefined tablesaccording to a downlink channel state; or may be notified by a basestation to UE, and specifically, a method for notifying the UE by thebase station may be that the base station selects one of at least twopredefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table. An MCS table is usedfor describing a mapping relationship between an MCS index and an entry.In this embodiment of the present invention, the mapping relationship inthe MCS table is merely an example given for the convenience ofunderstanding the present invention, and a representation form of theMCS table in the present invention includes, but is not limited to, theexample. That is, the MCS table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between an MCS index and anentry can be reflected.

The method includes the following steps:

S401: UE receives a first MCS index sent by a base station.

The first MCS index is determined by the base station according to anacquired first MCS table.

S402: The UE determines a modulation order and a code block sizeaccording to a first MCS table and the received first MCS index.

The first MCS table includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The first MCS table includes the entries in which the modulation schemesare higher than 64QAM; and the first MCS table further includes the atleast one entry in which the modulation scheme is QPSK in the second MCStable, and MCS indices, corresponding to entries in which modulationschemes are QPSK, in the second MCS table cannot only be entriescorresponding to K consecutive maximum MCS indices, where K is equal to4 or K is a positive integer less than 5 or K is a positive integer;and/or the first MCS table further includes the at least one entry inwhich the modulation scheme is 16QAM in the second MCS table. Modulationschemes in entries in the second MCS table include only QPSK, 16QAM, and64QAM. An entry in the first MCS table refers to one modulation schemeand one TBS index that correspond to each MCS index in the first MCStable, and an entry in the second MCS table refers to one modulationscheme and one TBS index that correspond to each MCS index in the secondMCS table.

The combination is a combination formed by the at least one entry inwhich the modulation scheme is QPSK in the second MCS table. Using thesecond MCS table shown in Table 6 as an example, there are in total2¹⁰−1=1023 combinations formed by the at least one entry in which themodulation scheme is QPSK in the second MCS table. For example, thecombination may be a combination formed by an entry corresponding to aCQI index 6 in the second MCS table, may be a combination formed byentries corresponding to MCS indices 6, 7, 8, and 9 in the second MCStable, may be a combination formed by entries corresponding to CQIindices 3, 6, 7, 8, and 9 in the second CQI table, or the like.

It should be noted that the first MCS table in this embodiment may beany one of the six types of first MCS tables in the foregoingembodiment, and details are not described herein again.

Specifically, the determining a modulation order and a code block sizeaccording to a first MCS table and the received first MCS indexincludes:

determining a first TBS index and the modulation order according to thefirst MCS table and the received first MCS index; and

determining the code block size according to the first TBS index, afirst PRB quantity, and a first TBS table.

The first PRB quantity is a PRB quantity allocated by the base stationto the UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient.

The first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table.

A value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26; or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

Further, the UE receives a PDSCH according to the modulation order andthe code block size.

The present invention provides a notification method for a channelquality indicator and a modulation and coding scheme, which supports UEin selecting a modulation scheme higher than 64QAM and notifying a basestation by using a method of sending a CQI index, and meanwhile supportsthe base station in selecting a modulation scheme higher than 64QAM andnotifying the UE by using a method of sending an MCS index, therebyimproving system performance. Further, using the modulation schemehigher than 64QAM can provide higher quantization accuracy for an areawith a high signal-to-noise ratio, thereby improving the systemperformance.

As shown in FIG. 5, an embodiment of the present invention provides anotification apparatus 50 for a CQI. The apparatus 50 includes:

an acquiring module 51, configured to acquire a first CQI table, wherethe first CQI table may be predefined by UE, or may be notified by abase station to UE, or is selected by UE from at least two predefinedtables according to a downlink channel state, where specifically, amethod for notifying the UE by the base station may be that the basestation selects one of at least two predefined tables according to auplink channel state or a downlink channel state, and reports the tableto the UE; and the CQI table is used for describing a mappingrelationship between a CQI index and an entry, that is, the mappingrelationship is not limited to being indicated by using a table, and maybe indicated by using an expression;

a first acquiring module 52, configured to learn a first CQI indexaccording to the first CQI table acquired by the acquiring module 51;and

a sending module 53, configured to send the first CQI index learned bythe first acquiring module 52 to a base station, so that the basestation determines a first modulation and coding scheme MCS indexaccording to the first CQI index;

where the first CQI table acquired by the acquiring module 51 includes:

entries in which modulation schemes are higher than 64 quadratureamplitude modulation QAM; and

at least one entry in which a modulation scheme is quadrature phaseshift keying QPSK in a second CQI table, where the at least one entry inwhich the modulation scheme is QPSK includes a combination except afirst combination of combinations formed by the at least one entry inwhich the modulation scheme is QPSK in the second CQI table, and thefirst combination is N entries with consecutive maximum CQI indicescorresponding to QPSK in the second CQI table, where N is equal to 3 orN is a positive integer less than 4 or N is a positive integer; and/orat least one entry in which a modulation scheme is 16QAM in the secondCQI table, where

modulation schemes in entries in the second CQI table include only QPSK,16QAM, and 64QAM.

The at least one entry in which the modulation scheme is QPSK in thesecond CQI table in the first CQI table acquired by the acquiring moduleincludes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond CQI table in the first CQI table acquired by the acquiring moduleincludes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

Further, the first CQI table acquired by the acquiring module 51 furtherincludes: at least one entry in which a modulation scheme is 64QAM inthe second CQI table.

Specifically, the at least one entry in which the modulation scheme is64QAM in the first CQI table acquired by the acquiring module includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

Further, a spectrum efficiency in an entry that is corresponding to aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table acquired by the acquiringmodule 51 is equal to a spectrum efficiency in an entry that iscorresponding to a maximum CQI index and of all entries in whichmodulation schemes are 64QAM in the second CQI table.

Further, spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule 51 are arranged in an arithmetic progression or approximately inan arithmetic progression in ascending order of spectrum efficiency,where: that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the Xentries, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the X entries, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value, where X is an integer greater than2.

Further, the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the acquiring module 51include: at least three entries in which modulation schemes are 256QAM,where spectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

Further, the first CQI table acquired by the acquiring module 51includes: at least three entries in which modulation schemes are higherthan 64QAM, where spectrum efficiencies in the at least three entries inwhich the modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency, where: that spectrumefficiencies in the at least three entries in which the modulationschemes are higher than 64QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged approximatelyin an arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

Further, the constant is less than or equal to a first threshold.

Further, an absolute value of a difference between spectrum efficienciesin any two adjacent entries of X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule 51 is less than or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the acquiring module include: at least twoentries in which modulation schemes are 256QAM, where an absolute valueof a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the acquiring module includes: at leasttwo entries in which modulation schemes are higher than 64QAM, where anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries of the at least two entries in which the modulationschemes are higher than 64QAM is less than or equal to a firstthreshold.

Further, X=3.

Further, the first threshold is a minimum value of an absolute value ofa difference between spectrum efficiencies in any two adjacent entriesin which modulation schemes are lower than or equal to 64QAM in thefirst CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are the same and the modulation schemes arelower than or equal to 64QAM in the first CQI table, or is a minimumvalue of an absolute value of a difference between spectrum efficienciesin any two adjacent entries in which modulation schemes are equal to64QAM in the first CQI table, or is a minimum value of an absolute valueof a difference between spectrum efficiencies in any two adjacententries in which modulation schemes are equal to 16QAM in the first CQItable, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are equal to QPSK in the first CQI table.

Further, a value range of a CQI index in the first CQI table acquired bythe acquiring module 51 is the same as a value range of a CQI index inthe second CQI table.

The notification apparatus for a CQI shown in FIG. 5 can performcorresponding steps in the foregoing method embodiments. For details,reference may be made to descriptions of the foregoing methodembodiments, and for effects achieved by the apparatus, reference mayalso be made to the descriptions of the foregoing method embodiments.

As shown in FIG. 6, an embodiment of the present invention furtherprovides a notification apparatus 60 for an MCS. The apparatus 60includes:

an acquiring module 61, configured to acquire a first CQI table and afirst MCS table, where the first CQI table may be predefined in aprotocol, and preset by UE according to protocol specifications, orpre-stored by UE, or may be selected by UE from at least two predefinedtables according to a downlink channel state, or may be notified by abase station to UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table; a CQI table is used fordescribing a mapping relationship between a CQI index and an entry; inthis embodiment of the present invention, the mapping relationship inthe CQI table is merely an example given for the convenience ofunderstanding the present invention; a representation form of the CQItable in the present invention includes, but is not limited to, theexample, that is, the CQI table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between a CQI index and anentry can be reflected; and

the first MCS table may be predefined in a protocol, for example presetby the UE according to protocol specifications, or pre-stored by the UE,or may be selected by the UE from at least two predefined tablesaccording to a downlink channel state, or may be notified by the basestation to the UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table; an MCS table is usedfor describing a mapping relationship between an MCS index and an entry;in this embodiment of the present invention, the mapping relationship inthe MCS table is merely an example given for the convenience ofunderstanding the present invention; a representation form of the MCStable in the present invention includes, but is not limited to, theexample, that is, the MCS table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between an MCS index and anentry can be reflected;

a receiving module 62, configured to receive a first CQI index sent bythe terminal UE, where the first CQI index is determined by the UEaccording to the first CQI table;

a determining module 63, configured to determine a first MCS indexaccording to the first CQI table acquired by the acquiring module 61,the first MCS table acquired by the acquiring module 61, and the firstCQI index received by the receiving module 62; and

a sending module 64, configured to send the determined first MCS indexto the UE;

where the first CQI table acquired by the acquiring module 61 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second CQI table, and the first combination is N entries withconsecutive maximum CQI indices corresponding to QPSK in the second CQItable, where N is equal to 3 or N is a positive integer less than 4 or Nis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second CQI table, where

modulation schemes in the second CQI table include only QPSK, 16QAM, and64QAM.

The first MCS table acquired by the acquiring module 61 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a second combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the second combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The determining module 63 is specifically configured to:

determine a first TBS index and the first MCS index according to a firstPRB quantity acquired by the acquiring module 61, the first CQI tableacquired by the acquiring module 61, the first MCS table acquired by theacquiring module 61, and the received first CQI index, where:

the first PRB quantity is a PRB quantity allocated by the base stationto the UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient;

a first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

The determining module 63 includes:

a first determining submodule 631, configured to determine, according tothe first CQI table acquired by the acquiring module 61 and the firstCQI index received by the receiving module, a first modulation schemeand a first spectrum efficiency that correspond to the received firstCQI index; and

a second determining submodule 632, configured to learn, according tothe acquired first PRB quantity and the first spectrum efficiencydetermined by the first determining submodule, a first transport blocksize transmitted to the UE; and obtain, according to the first TBStable, the first TBS index that corresponds to the first transport blocksize determined by the second determining submodule and the first PRBquantity in the first TBS table.

The at least one entry in which the modulation scheme is QPSK in thesecond CQI table in the first CQI table acquired by the acquiring module61 includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond CQI table in the first CQI table acquired by the acquiring module61 includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

Further, the first CQI table acquired by the acquiring module 61 mayfurther include:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

Specifically, the at least one entry in which the modulation scheme is64QAM in the second CQI table in the first CQI table acquired by theacquiring module 61 includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

Further, a spectrum efficiency in an entry that is corresponding to aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table acquired by the acquiringmodule 61 is equal to a spectrum efficiency in an entry that iscorresponding to a maximum CQI index and of all entries in whichmodulation schemes are 64QAM in the second CQI table.

Further, spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule 61 are arranged in an arithmetic progression or approximately inan arithmetic progression in ascending order of spectrum efficiency,where: that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged in an arithmetic progression inascending order of spectrum efficiency indicates that, in ascendingorder of spectrum efficiency and starting from a second entry of the Xentries, a difference between a spectrum efficiency in each entry and aspectrum efficiency in a previous entry of the entry is equal to a sameconstant; and that spectrum efficiencies in X entries that arecorresponding to maximum CQI indices and of the entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the X entries, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is within a range from a constant minus a preset value tothe constant plus the preset value, where X is an integer greater than2.

Further, the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the acquiring module 61include: at least three entries in which modulation schemes are 256QAM,where spectrum efficiencies in the at least three entries in which themodulation schemes are 256QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

Further, the first CQI table acquired by the acquiring module 61includes: at least three entries in which modulation schemes are higherthan 64QAM, where spectrum efficiencies in the at least three entries inwhich the modulation schemes are higher than 64QAM are arranged in anarithmetic progression or approximately in an arithmetic progression inascending order of spectrum efficiency, where: that spectrumefficiencies in the at least three entries in which the modulationschemes are higher than 64QAM are arranged in an arithmetic progressionor approximately in an arithmetic progression in ascending order ofspectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the at least threeentries in which the modulation schemes are higher than 64QAM, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in the at least three entries in whichthe modulation schemes are higher than 64QAM are arranged approximatelyin an arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

Further, the constant is less than or equal to a first threshold.

Further, an absolute value of a difference between spectrum efficienciesin any two adjacent entries of X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table acquired by the acquiringmodule 61 is less than or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the acquiring module 61 include: at leasttwo entries in which modulation schemes are 256QAM, where an absolutevalue of a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the acquiring module 61 includes: atleast two entries in which modulation schemes are higher than 64QAM,where an absolute value of a difference between spectrum efficiencies inany two adjacent entries of the at least two entries in which themodulation schemes are higher than 64QAM is less than or equal to afirst threshold.

Further, X=3.

Further, the first threshold is a minimum value of an absolute value ofa difference between spectrum efficiencies in any two adjacent entriesin which modulation schemes are lower than or equal to 64QAM in thefirst CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are the same and the modulation schemes arelower than or equal to 64QAM in the first CQI table, or is a minimumvalue of an absolute value of a difference between spectrum efficienciesin any two adjacent entries in which modulation schemes are equal to64QAM in the first CQI table, or is a minimum value of an absolute valueof a difference between spectrum efficiencies in any two adjacententries in which modulation schemes are equal to 16QAM in the first CQItable, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are equal to QPSK in the first CQI table.

Further, a value range of a CQI index in the first CQI table acquired bythe acquiring module 61 is the same as a value range of a CQI index inthe second CQI table.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first CQI table acquired by the acquiring module61 includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first CQI table acquired by the acquiring module61 includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

Further, the first MCS table acquired by the acquiring module 61 furtherincludes: at least one entry in which a modulation scheme is 64QAM inthe second MCS table.

Specifically, the at least one entry in which the modulation scheme is64QAM in the second MCS table in the first CQI table acquired by theacquiring module 61 includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

Further, the at least one entry in which the modulation scheme is 64QAMin the second MCS table includes: a TBS index in an entry that iscorresponding to a minimum MCS index and of all entries in whichmodulation schemes are higher than 64QAM in the first MCS table acquiredby the acquiring module 61 is the same as a TBS index in an entry with amaximum MCS index of all the entries in which the modulation schemes are64QAM in the second MCS table.

Further, a value range of an MCS index in the first MCS table acquiredby the acquiring module 61 is the same as a value range of an MCS indexin the second MCS table.

The notification apparatus for an MCS shown in FIG. 6 can performcorresponding steps in the foregoing method embodiments. For details,reference may be made to descriptions of the foregoing methodembodiments, and for effects achieved by the apparatus, reference mayalso be made to the descriptions of the foregoing method embodiments.

As shown in FIG. 7, an embodiment of the present invention furtherprovides a notification apparatus 70 for an MCS. The apparatus 70includes:

an acquiring module 71, configured to acquire a first CQI table and afirst MCS table, where the first CQI table may be predefined in aprotocol, and preset by UE according to protocol specifications, orpre-stored by UE, or may be selected by UE from at least two predefinedtables according to a downlink channel state, or may be notified by abase station to UE, and specifically, a method for notifying the UE bythe base station may be that the base station selects one of at leasttwo predefined tables according to an uplink channel state or a downlinkchannel state, and notifies the UE of the table; a CQI table is used fordescribing a mapping relationship between a CQI index and an entry; inthis embodiment of the present invention, the mapping relationship inthe CQI table is merely an example given for the convenience ofunderstanding the present invention; a representation form of the CQItable in the present invention includes, but is not limited to, theexample, that is, the CQI table may have multiple combinations, and thecombinations shall fall within the protection scope of the presentinvention as long as a mapping relationship between a CQI index and anentry can be reflected; and the first MCS table may be predefined in aprotocol, for example, preset by the UE according to protocolspecifications, or pre-stored by the UE, or may be selected by the UEfrom at least two predefined tables according to a downlink channelstate, or may be notified by the base station to the UE, andspecifically, a method for notifying the UE by the base station may bethat the base station selects one of at least two predefined tablesaccording to an uplink channel state or a downlink channel state, andnotifies the UE of the table; an MCS table is used for describing amapping relationship between an MCS index and an entry; in thisembodiment of the present invention, the mapping relationship in the MCStable is merely an example given for the convenience of understandingthe present invention; a representation form of the MCS table in thepresent invention includes, but is not limited to, the example, that is,the MCS table may have multiple combinations, and the combinations shallfall within the protection scope of the present invention as long as amapping relationship between an MCS index and an entry can be reflected;

a receiving module 72, configured to receive, by the base station, afirst CQI index, where the first CQI index is determined by the UEaccording to the first CQI table;

a determining module 73, configured to determine a first MCS indexaccording to the first CQI table acquired by the acquiring module 71,the first MCS table acquired by the acquiring module 71, and the firstCQI index received by the receiving module 72; and

a sending module 74, configured to send the first MCS index determinedby the determining module 73 to the UE;

where the first CQI table acquired by the acquiring module 71 includes:entries in which modulation schemes are higher than 64QAM, where anentry in the first CQI table refers to one modulation scheme, one coderate, and one spectrum efficiency that correspond to each CQI index inthe first CQI table; and

the first MCS table acquired by the acquiring module 71 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first MCS table acquired by the acquiring module71 includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first MCS table acquired by the acquiring module71 includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

Further, the first MCS table acquired by the acquiring module 71 furtherincludes: at least one entry in which a modulation scheme is 64QAM inthe second MCS table.

Specifically, the at least one entry in which the modulation scheme is64QAM in the second MCS table in the first MCS table acquired by theacquiring module 71 includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

Further, the at least one entry in which the modulation scheme is 64QAMin the second MCS table in the first MCS table acquired by the acquiringmodule 71 includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table acquired by the acquiring module 71 is the same as a TBSindex in an entry with a maximum MCS index of all the entries in whichthe modulation schemes are 64QAM in the second MCS table.

Further, a value range of an MCS index in the first MCS table acquiredby the acquiring module 71 is the same as a value range of an MCS indexin the second MCS table.

The notification apparatus for an MCS shown in FIG. 7 can performcorresponding steps in the foregoing method embodiments. For details,reference may be made to descriptions of the foregoing methodembodiments, and for effects achieved by the apparatus, reference mayalso be made to the descriptions of the foregoing method embodiments.

As shown in FIG. 8, an embodiment of the present invention furtherprovides a notification apparatus 80 for an MCS. The apparatus 80includes:

an acquiring module 81, configured to acquire a first MCS table, where

the first MCS table may be predefined in a protocol, and preset by UEaccording to protocol specifications, or pre-stored by UE, or may beselected by UE from at least two predefined tables according to adownlink channel state, or may be notified by a base station to UE, andspecifically, a method for notifying the UE by the base station may bethat the base station selects one of at least two predefined tablesaccording to an uplink channel state or a downlink channel state, andnotifies the UE of the table; an MCS table is used for describing amapping relationship between an MCS index and an entry; in thisembodiment of the present invention, the mapping relationship in the MCStable is merely an example given for the convenience of understandingthe present invention; a representation form of the MCS table in thepresent invention includes, but is not limited to, the example, that is,the MCS table may have multiple combinations, and the combinations shallfall within the protection scope of the present invention as long as amapping relationship between an MCS index and an entry can be reflected;

a receiving module 82, configured to receive a first MCS index sent by abase station, where the first MCS index is determined by the basestation according to the first MCS table; and

a determining module 83, configured to determine a modulation order anda code block size according to the first MCS table and the first MCSindex received by the receiving module 82;

where the first MCS table acquired by the acquiring module 81 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The determining module 83 includes:

a first determining submodule 831, configured to determine a first TBSindex and the modulation order according to the first MCS table acquiredby the acquiring module 81 and the received first MCS index; and

a second determining submodule 832, configured to determine the codeblock size according to the first TBS index, a first PRB quantity, and afirst TBS table, where:

the first PRB quantity is a PRB quantity allocated by the base stationto the UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient;

the first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first MCS table acquired by the acquiring module81 includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first MCS table acquired by the acquiring module81 includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

Further, the first MCS table acquired by the acquiring module 81 furtherincludes: at least one entry in which a modulation scheme is 64QAM inthe second MCS table.

Specifically, the at least one entry in which the modulation scheme is64QAM in the second MCS table in the first MCS table acquired by theacquiring module 81 includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

Further, the at least one entry in which the modulation scheme is 64QAMin the second MCS table in the first MCS table acquired by the acquiringmodule 81 includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

Further, a value range of an MCS index in the first MCS table acquiredby the acquiring module 81 is the same as a value range of an MCS indexin the second MCS table.

The notification apparatus for an MCS shown in FIG. 8 can performcorresponding steps in the foregoing method embodiments. For details,reference may be made to descriptions of the foregoing methodembodiments, and for effects achieved by the apparatus, reference mayalso be made to the descriptions of the foregoing method embodiments.

As shown in FIG. 9, an embodiment of the present invention furtherprovides a notification apparatus 90 for a channel quality indicatorCQI, including a processor 91 and a transmitter 92, where

the processor 91 is configured to acquire a first CQI table; andconfigured to learn a first CQI index according to the first CQI table;and

the transmitter 92 is configured to send the first CQI index learned bythe processor 91 to a base station, so that the base station determinesa first modulation and coding scheme MCS index according to the firstCQI index;

where the first CQI table acquired by the processor 91 includes:

entries in which modulation schemes are higher than 64 quadratureamplitude modulation QAM; and

at least one entry in which a modulation scheme is quadrature phaseshift keying QPSK in a second CQI table, where the at least one entry inwhich the modulation scheme is QPSK includes a combination except afirst combination of combinations formed by the at least one entry inwhich the modulation scheme is QPSK in the second CQI table, and thefirst combination is N entries with consecutive maximum CQI indicescorresponding to QPSK in the second CQI table, where N is equal to 3 orN is a positive integer less than 4 or N is a positive integer; and/orat least one entry in which a modulation scheme is 16QAM in the secondCQI table, where

modulation schemes in entries in the second CQI table include only QPSK,16QAM, and 64QAM.

The at least one entry in which the modulation scheme is QPSK in thesecond CQI table in the first CQI table acquired by the processor 91includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond CQI table in the first CQI table acquired by the processor 91includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

The first CQI table acquired by the processor 91 further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

The at least one entry in which the modulation scheme is 64QAM in thefirst CQI table acquired by the processor 91 includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

Further, a spectrum efficiency in an entry that is corresponding to aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table acquired by the processor 91 isequal to a spectrum efficiency in an entry that is corresponding to amaximum CQI index and of all entries in which modulation schemes are64QAM in the second CQI table.

Spectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM in the first CQI table acquired by the processor 91 arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency, where: thatspectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM are arranged in an arithmetic progression in ascending orderof spectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the X entries, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged approximately in an arithmeticprogression in ascending order of spectrum efficiency indicates that, inascending order of spectrum efficiency and starting from a second entryof the X entries, a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry iswithin a range from a constant minus a preset value to the constant plusthe preset value, where X is an integer greater than 2.

The entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the processor 91 include: at least threeentries in which modulation schemes are 256QAM, where spectrumefficiencies in the at least three entries in which the modulationschemes are 256QAM are arranged in an arithmetic progression orapproximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

The first CQI table acquired by the processor 91 includes: at leastthree entries in which modulation schemes are higher than 64QAM, wherespectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged in an arithmeticprogression or approximately in an arithmetic progression in ascendingorder of spectrum efficiency, where: that spectrum efficiencies in theat least three entries in which the modulation schemes are higher than64QAM are arranged in an arithmetic progression or approximately in anarithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is equal to a same constant; and thatspectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

The constant is less than or equal to a first threshold.

An absolute value of a difference between spectrum efficiencies in anytwo adjacent entries of X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM in the first CQI table acquired by the processor 91 is lessthan or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the processor 91 include: at least twoentries in which modulation schemes are 256QAM, where an absolute valueof a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the processor 91 includes: at least twoentries in which the modulation schemes are higher than 64QAM, where anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries of the at least two entries in which the modulationschemes are higher than 64QAM is less than or equal to a firstthreshold.

X=3.

The first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

A value range of a CQI index in the first CQI table acquired by theprocessor 91 is the same as a value range of a CQI index in the secondCQI table.

As shown in FIG. 10, an embodiment of the present invention furtherprovides a notification apparatus 10 for a modulation and coding schemeMCS, including:

a processor 101, configured to acquire a first CQI table and a first MCStable;

a receiver 102, configured to receive a first channel quality indicatorCQI index sent by terminal UE, where the first CQI index is determinedby the UE according to the first CQI table, where the processor 101 isconfigured to determine a first MCS index according to the first CQItable acquired by the processor 101, the first MCS table acquired by theprocessor 101, and the first CQI index received by the receiver; and

a transmitter 103, configured to send the first MCS index determined bythe processor 101 to the UE;

where the first CQI table acquired by the processor 101 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second CQItable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second CQI table, and the first combination is N entries withconsecutive maximum CQI indices corresponding to QPSK in the second CQItable, where N is equal to 3 or N is a positive integer less than 4 or Nis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second CQI table, where

modulation schemes in the second CQI table include only QPSK, 16QAM, and64QAM.

The first MCS table acquired by the processor 101 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a second combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the second combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The processor 101 is specifically configured to:

determine a first TBS index and the first MCS index according to anacquired first PRB quantity, the first CQI table acquired by theprocessor 101, the first MCS table acquired by the processor 101, andthe received first CQI index, where:

the first PRB quantity is a PRB quantity allocated by a base station tothe UE, or the first PRB quantity is a maximum integer less than orequal to a product of a PRB quantity allocated to the UE and a specificcoefficient;

a first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

The processor 101 is specifically configured to:

determine, according to the first CQI table acquired by the processor101 and the first CQI index received by the receiver 102, a firstmodulation scheme and a first spectrum efficiency that correspond to thereceived first CQI index;

learn, according to the first PRB quantity and the determined firstspectrum efficiency, a first transport block size transmitted to the UE;and

obtain, according to the first TBS table, the first TBS index thatcorresponds to the determined first transport block size and the firstPRB quantity in the first TBS table.

The at least one entry in which the modulation scheme is QPSK in thesecond CQI table in the first CQI table acquired by the processor 101includes:

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second CQItable, where CQI indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the second CQI table, where CQI indices corresponding to the someentries are inconsecutive; or

some entries in which modulation schemes are QPSK in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are QPSKin the CQI table, where CQI indices corresponding to the some entriesare consecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond CQI table in the first CQI table acquired by the processor 101includes:

all entries in which modulation schemes are 16QAM in the second CQItable; or at least one entry, except an entry corresponding to a minimumCQI index, of all entries in which modulation schemes are 16QAM in thesecond CQI table.

The first CQI table acquired by the processor 101 further includes:

at least one entry in which a modulation scheme is 64QAM in the secondCQI table.

The at least one entry in which the modulation scheme is 64QAM in thesecond CQI table in the first CQI table acquired by the processor 101includes:

all entries in which modulation schemes are 64QAM in the second CQItable; or

some entries in which modulation schemes are 64QAM in the second CQItable, and at least one entry, except an entry corresponding to amaximum CQI index, of all entries in which modulation schemes are 64QAMin the second CQI table.

A spectrum efficiency in an entry that is corresponding to a minimum CQIindex and of the entries in which the modulation schemes are higher than64QAM in the first CQI table acquired by the processor 101 is equal to aspectrum efficiency in an entry that is corresponding to a maximum CQIindex and of all entries in which modulation schemes are 64QAM in thesecond CQI table.

Spectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM in the first CQI table acquired by the processor 101 arearranged in an arithmetic progression or approximately in an arithmeticprogression in ascending order of spectrum efficiency, where: thatspectrum efficiencies in X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM are arranged in an arithmetic progression in ascending orderof spectrum efficiency indicates that, in ascending order of spectrumefficiency and starting from a second entry of the X entries, adifference between a spectrum efficiency in each entry and a spectrumefficiency in a previous entry of the entry is equal to a same constant;and that spectrum efficiencies in X entries that are corresponding tomaximum CQI indices and of the entries in which the modulation schemesare higher than 64QAM are arranged approximately in an arithmeticprogression in ascending order of spectrum efficiency indicates that, inascending order of spectrum efficiency and starting from a second entryof the X entries, a difference between a spectrum efficiency in eachentry and a spectrum efficiency in a previous entry of the entry iswithin a range from a constant minus a preset value to the constant plusthe preset value, where X is an integer greater than 2.

The entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the processor 101 include: at least threeentries in which modulation schemes are 256QAM, where spectrumefficiencies in the at least three entries in which the modulationschemes are 256QAM are arranged in an arithmetic progression orapproximately in an arithmetic progression in ascending order ofspectrum efficiency, where: that spectrum efficiencies in the at leastthree entries in which the modulation schemes are 256QAM are arranged inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are 256QAM, a difference between a spectrumefficiency in each entry and a spectrum efficiency in a previous entryof the entry is equal to a same constant; and that spectrum efficienciesin the at least three entries in which the modulation schemes are 256QAMare arranged approximately in an arithmetic progression in ascendingorder of spectrum efficiency indicates that, in ascending order ofspectrum efficiency and starting from a second entry of the at leastthree entries in which the modulation schemes are 256QAM, a differencebetween a spectrum efficiency in each entry and a spectrum efficiency ina previous entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

The first CQI table acquired by the processor 101 includes: at leastthree entries in which modulation schemes are higher than 64QAM, wherespectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged in an arithmeticprogression or approximately in an arithmetic progression in ascendingorder of spectrum efficiency, where: that spectrum efficiencies in theat least three entries in which the modulation schemes are higher than64QAM are arranged in an arithmetic progression or approximately in anarithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is equal to a same constant; and thatspectrum efficiencies in the at least three entries in which themodulation schemes are higher than 64QAM are arranged approximately inan arithmetic progression in ascending order of spectrum efficiencyindicates that, in ascending order of spectrum efficiency and startingfrom a second entry of the at least three entries in which themodulation schemes are higher than 64QAM, a difference between aspectrum efficiency in each entry and a spectrum efficiency in aprevious entry of the entry is within a range from a constant minus apreset value to the constant plus the preset value.

The constant is less than or equal to a first threshold.

An absolute value of a difference between spectrum efficiencies in anytwo adjacent entries of X entries that are corresponding to maximum CQIindices and of the entries in which the modulation schemes are higherthan 64QAM in the first CQI table acquired by the processor 101 is lessthan or equal to a first threshold; or

the entries in which the modulation schemes are higher than 64QAM in thefirst CQI table acquired by the processor 101 include: at least twoentries in which modulation schemes are 256QAM, where an absolute valueof a difference between spectrum efficiencies in any two adjacententries of the at least two entries in which the modulation schemes are256QAM is less than or equal to a first threshold; or

the first CQI table acquired by the processor 101 includes: at least twoentries in which modulation schemes are higher than 64QAM, where anabsolute value of a difference between spectrum efficiencies in any twoadjacent entries of the at least two entries in which the modulationschemes are higher than 64QAM is less than or equal to a firstthreshold.

X=3.

The first threshold is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are lower than or equal to 64QAM in the firstCQI table, or is a minimum value of an absolute value of a differencebetween spectrum efficiencies in any two adjacent entries in whichmodulation schemes are the same and the modulation schemes are lowerthan or equal to 64QAM in the first CQI table, or is a minimum value ofan absolute value of a difference between spectrum efficiencies in anytwo adjacent entries in which modulation schemes are equal to 64QAM inthe first CQI table, or is a minimum value of an absolute value of adifference between spectrum efficiencies in any two adjacent entries inwhich modulation schemes are equal to 16QAM in the first CQI table, oris a minimum value of an absolute value of a difference between spectrumefficiencies in any two adjacent entries in which modulation schemes areequal to QPSK in the first CQI table.

A value range of a CQI index in the first CQI table acquired by theprocessor 101 is the same as a value range of a CQI index in the secondCQI table.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first CQI table acquired by the processor 101includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first CQI table acquired by the processor 101includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

The first MCS table acquired by the processor 101 further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first CQI table acquired by the processor 101includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first CQI table acquired by the processor 101includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

A value range of an MCS index in the first MCS table acquired by theprocessor 101 is the same as a value range of an MCS index in the secondMCS table.

As shown in FIG. 11, an embodiment of the present invention furtherprovides a notification apparatus 11 for a modulation and coding schemeMCS, including:

a processor 111, configured to acquire a first MCS table; and

a receiver 112, configured to receive a first MCS index sent by a basestation, where the first MCS index is determined by the base stationaccording to the first MCS table acquired by the processor 111, wherethe processor 111 is configured to determine a modulation order and acode block size according to the first MCS table acquired by theprocessor and the first MCS index received by the receiver;

where the first MCS table acquired by the processor 111 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The processor 111 is specifically configured to:

determine a first TBS index and the modulation order according to thefirst MCS table acquired by the processor 111 and the received first MCSindex; and

determine the code block size according to the first TBS index, a firstPRB quantity, and a first TBS table, where:

the first PRB quantity is a PRB quantity allocated by the base stationto UE, or the first PRB quantity is a maximum integer less than or equalto a product of a PRB quantity allocated to UE and a specificcoefficient;

the first TBS table includes at least one PRB quantity corresponding toeach TBS index and a transport block size corresponding to each PRBquantity, where the first TBS table is a TBS table corresponding to thefirst MCS table; and

a value range of a TBS index in the first TBS table is 0 to A, where Ais a positive integer less than or equal to 26, or a value range of aTBS index in the first TBS table is 0 to B, where B is a positiveinteger greater than or equal to 26; a transport block sizecorresponding to a TBS index whose value range is 0 to 26 in the firstTBS table is the same as a transport block size corresponding to a TBSindex whose value range is 0 to 26 in a second TBS table; a value rangeof a TBS index in the second TBS table is 0 to 26; and the second TBStable includes at least one PRB quantity corresponding to each TBS indexand a transport block size corresponding to each PRB quantity.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first MCS table acquired by the processor 111includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first MCS table acquired by the processor 111includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

The first MCS table acquired by the processor 111 further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first MCS table acquired by the processor 111includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first MCS table acquired by the processor 111includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

A value range of an MCS index in the first MCS table acquired by theprocessor 111 is the same as a value range of an MCS index in the secondMCS table.

As shown in FIG. 12, the present invention provides a notificationapparatus for a modulation and coding scheme MCS, including:

a processor 121, configured to acquire a first CQI table and a first MCStable;

a receiver 122, configured to receive a first CQI index, where the firstCQI index is determined by UE according to the first CQI table, wherethe processor 121 is configured to determine a first MCS index accordingto the acquired first CQI table, the acquired first MCS table, and thefirst CQI index received by the receiver; and

a transmitter 123, configured to send the first MCS index determined bythe processor 121 to the UE;

where the first CQI table acquired by the processor 121 includes:entries in which modulation schemes are higher than 64QAM, where anentry in the first CQI table acquired by the processor 121 refers to onemodulation scheme, one code rate, and one spectrum efficiency thatcorrespond to each CQI index in the first CQI table acquired by theprocessor 121; and

the first MCS table acquired by the processor 121 includes:

entries in which modulation schemes are higher than 64QAM; and

at least one entry in which a modulation scheme is QPSK in a second MCStable, where the at least one entry in which the modulation scheme isQPSK includes a combination except a first combination of combinationsformed by the at least one entry in which the modulation scheme is QPSKin the second MCS table, and the first combination is K entries withconsecutive maximum MCS indices corresponding to QPSK in the second MCStable, where K is equal to 4 or K is a positive integer less than 5 or Kis a positive integer; and/or at least one entry in which a modulationscheme is 16QAM in the second MCS table, where

modulation schemes in the second MCS table include only QPSK, 16QAM, and64QAM.

The at least one entry in which the modulation scheme is QPSK in thesecond MCS table in the first MCS table acquired by the processor 121includes:

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areinconsecutive; or

some entries in which modulation schemes are QPSK in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are QPSK in the second MCStable, where MCS indices corresponding to the some entries areconsecutive.

The at least one entry in which the modulation scheme is 16QAM in thesecond MCS table in the first MCS table acquired by the processor 121includes:

all entries in which modulation schemes are 16QAM in the second MCStable; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are at equalintervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries are not atequal intervals; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum second MCSindex, of all entries in which modulation schemes are 16QAM in thesecond MCS table, where MCS indices corresponding to the some entriesare inconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS index,of all entries in which modulation schemes are 16QAM in the second MCStable, where MCS indices corresponding to the some entries areconsecutive; or

some entries in which modulation schemes are 16QAM in the second MCStable, and at least one entry, except an entry with a maximum MCS indexand an entry with a minimum MCS index, of all entries in whichmodulation schemes are 16QAM in the second MCS table.

The first MCS table acquired by the processor 121 further includes:

at least one entry in which a modulation scheme is 64QAM in the secondMCS table.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first MCS table acquired by the processor 121includes:

all entries in which modulation schemes are 64QAM in the second MCStable; or

some entries in which modulation schemes are 64QAM in the second MCStable, and at least one entry, except an entry with a minimum MCS index,of all entries in which modulation schemes are 64QAM in the second MCStable.

The at least one entry in which the modulation scheme is 64QAM in thesecond MCS table in the first MCS table acquired by the processor 121includes:

a TBS index in an entry that is corresponding to a minimum MCS index andof all entries in which modulation schemes are higher than 64QAM in thefirst MCS table is the same as a TBS index in an entry with a maximumMCS index of all the entries in which the modulation schemes are 64QAMin the second MCS table.

A value range of an MCS index in the first MCS table acquired by theprocessor 121 is the same as a value range of an MCS index in the secondMCS table.

It should be noted that the apparatuses shown in FIG. 9 to FIG. 12 canseparately implement the methods provided in the foregoing methodembodiments. For details, reference may be made to descriptions of theforegoing embodiments, and for effects achieved by the apparatuses,reference may also be made to the descriptions of the foregoingembodiments.

It may be clearly understood by persons skilled in the art that, for thepurpose of convenient and brief description, division of the foregoingfunctional modules is merely used as an example for description. Inactual applications, the foregoing functions can be allocated todifferent functional modules and implemented according to a requirement,that is, the inner structure of the apparatus is divided into differentfunctional modules to implement all or some of the functions describedabove. For a detailed working process of the foregoing system,apparatus, and unit, reference may be made to a corresponding process inthe foregoing method embodiments, and details are not provided hereinagain.

In the several embodiments provided in this application, it should beunderstood that the disclosed system, apparatus, and method may beimplemented in other manners. For example, the described apparatusembodiment is merely exemplary. For example, the unit division is merelylogical function division and may be other division in actualimplementation. For example, multiple units or components may becombined or integrated into another system, or some features may beignored or not performed. In addition, the displayed or discussed mutualcouplings or direct couplings or communication connections may beimplemented by using some interfaces. The indirect couplings orcommunication connections between the apparatuses or units may beimplemented in electronic, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparate, and parts displayed as units may or may not be physical units,may be located in one position, or may be distributed on multiplenetwork units. Some or all of the units may be selected according toactual needs to achieve the objectives of the solutions of theembodiments.

In addition, functional units in the embodiments of the presentinvention may be integrated into one processing unit, or each of theunits may exist alone physically, or two or more units are integratedinto one unit. The integrated unit may be implemented in a form ofhardware, or may be implemented in a form of hardware in addition to asoftware functional unit.

When the foregoing integrated unit is implemented in a form of asoftware functional unit, the integrated unit may be stored in acomputer-readable storage medium. The software functional unit is storedin a storage medium and includes several instructions for instructing acomputer device (which may be a personal computer, a server, or anetwork device) to perform some of the steps of the methods described inthe embodiments of the present invention. The foregoing storage mediumincludes: any medium that can store program code, such as a USB flashdrive, a removable hard disk, a read-only memory (ROM for short), arandom access memory (RAM for short), a magnetic disk, or an opticaldisc.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of the present inventionrather than limiting the present invention. Although the presentinvention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solutions describedin the foregoing embodiments or make equivalent replacements to sometechnical features thereof, as long as such modifications orreplacements do not cause the essence of corresponding technicalsolutions to depart from the spirit and scope of the technical solutionsof the embodiments of the present invention.

What is claimed is:
 1. A notification method for a channel qualityindicator (CQI), the method comprising: acquiring a first CQI indexaccording to an acquired first CQI table; and sending the first CQIindex to a base station; wherein the first CQI table comprises: (a)multiple entries in which modulation schemes are higher than 64quadrature amplitude modulation (QAM); (b) multiple entries in a secondCQI table and in which modulation schemes are quadrature phase shiftkeying (QPSK); and (c) all entries in the second CQI table and in whichmodulation schemes are 16QAM; wherein the second CQI table comprises 6entries in which the modulation schemes are QPSK, the 6 entries areassociated with CQI indices 1-6 respectively, and wherein entriesassociated with CQI indices 3, 4, 5, and 6 in the second CQI table areentries in which code rates are highest in the 6 entries; wherein, acombination formed by the multiple entries in which the modulationschemes are QPSK in the first CQI table, is neither a combination of theentries associated with CQI indices 4, 5 and 6 in the second CQI table,nor a combination of the entries associated with CQI indices 3, 4, 5 and6 in the second CQI table; wherein a spectrum efficiency in an entrythat is associated with a minimum CQI index and of the entries in whichthe modulation schemes are higher than 64QAM in the first CQI table, isequal to a spectrum efficiency in an entry that is associated with amaximum CQI index and of all entries in which modulation schemes are64QAM in the second CQI table; and wherein modulation schemes in entriesin the second CQI table comprise only QPSK, 16QAM, and 64QAM, and avalue range of a CQI index in the first CQI table is the same as a valuerange of a CQI index in the second CQI table.
 2. The method according toclaim 1, wherein the multiple entries in which the modulation schemesare QPSK in the first CQI table, are multiple entries in the second CQItable and in which modulation schemes are QPSK, wherein CQI indicesassociated with the multiple entries are at equal intervals.
 3. Themethod according to claim 1, wherein the first CQI table furthercomprises: multiple entries in the second CQI table and in which amodulation schemes are 64QAM.
 4. The method according to claim 3,wherein the multiple entries in the second CQI table and in which themodulation schemes are 64QAM further comprise: at least one entry,except an entry associated with a maximum CQI index, of all entries inwhich modulation schemes in the second CQI table are 64QAM.
 5. Themethod according to claim 1, wherein a spectrum efficiency in an entrythat is associated with a minimum CQI index and of the entries in whichthe modulation schemes are higher than 64QAM in the first CQI table, isequal to a spectrum efficiency in an entry that is associated with amaximum CQI index and of all entries in which modulation schemes are64QAM in the second CQI table.
 6. A notification method for a modulationand coding scheme (MCS), the method comprising: receiving a firstchannel quality indicator (CQI) index sent by a terminal device, whereinthe first CQI index is determined by the terminal device according to anacquired first CQI table; determining a first MCS index according to thefirst CQI table, a first MCS table, and the first CQI index; and sendingthe determined first MCS index to the terminal device; wherein the firstCQI table comprises: (a) multiple entries in which modulation schemesare higher than 64 quadrature amplitude modulation (QAM); (b) multipleentries in a second CQI table and in which modulation schemes arequadrature phase shift keying (QPSK), and (c) all entries in the secondCQI table and in which modulation schemes are 16QAM; wherein the secondCQI table comprises 6 entries in which the modulation schemes are QPSK,the 6 entries are associated with CQI indices 1-6 respectively, andwherein entries associated with CQI indices 3, 4, 5, and 6 in the secondCQI table are entries in which code rates are highest in the 6 entries;wherein, a combination formed by the multiple entries in which themodulation schemes are QPSK in the first CQI table, is neither acombination of the entries corresponding to CQI indices 4, 5, and 6 inthe second CQI table, nor a combination of the entries corresponding toCQI indices 3, 4, 5 and 6 in the second CQI table; wherein a spectrumefficiency in an entry that is associated with a minimum CQI index andof the entries in which the modulation schemes are higher than 64QAM inthe first CQI table, is equal to a spectrum efficiency in an entry thatis associated with a maximum CQI index and of all entries in whichmodulation schemes are 64QAM in the second CQI table; wherein modulationschemes in the second CQI table comprise only QPSK, 16QAM, and 64QAM,and a value range of a CQI index in the first CQI table is the same as avalue range of a CQI index in the second CQI table; and wherein thefirst MCS table comprises: (i) multiple entries in which modulationschemes are higher than 64QAM; (ii) multiple entries in a second MCStable and in which a modulation schemes are QPSK, and (iii) multipleentries in the second MCS table and in which a modulation scheme is16QAM; wherein the second MCS table comprises 10 entries in which themodulation schemes are QPSK, the 10 entries are associated with MCSindices 0-9 respectively, and wherein entries associated with MCSindices 4, 5, 6, 7, 8 and 9 in the second MCS table are entries in whichcode rates are highest in the 10 entries; wherein, a combination formedby the multiple entries in which the modulation schemes are QPSK in thefirst MCS table, is not a combination of the entries associated with MCSindices 5, 6, 7, 8 and 9 in the second MCS table; wherein a transportblock size (TBS) index in an entry that is associated with a minimum MCSindex and of all entries in which modulation schemes are higher than64QAM in the first MCS table, is the same as a TBS index in an entrywith a maximum MCS index of all the entries in which the modulationschemes are 64QAM in the second MCS table; wherein the entry in thefirst MCS table refers to one modulation scheme and one TBS index thatassociated with each MCS index in the first MCS table, and the entry inthe second MCS table refers to one modulation scheme and one TBS indexthat are associated with each MCS index in the second MCS table.
 7. Themethod according to claim 6, wherein the multiple entries in which themodulation schemes are QPSK in the first CQI table, are multiple entriesin the second CQI table and in which modulation schemes are QPSK,wherein CQI indices associated with the multiple entries are at equalintervals.
 8. The method according to claim 6, wherein the first CQItable further comprises: multiple entries in the second CQI table and inwhich modulation schemes are 64QAM.
 9. The method according to claim 8,wherein the multiple entries in the second CQI table and in which themodulation schemes are 64QAM further comprise: multiple entries in thesecond CQI table, except an entry associated with a maximum CQI index,of all entries in which modulation schemes are 64QAM.
 10. The methodaccording to claim 6, wherein a spectrum efficiency in the second CQItable and in an entry that is associated with a minimum CQI index and ofthe entries in which the modulation schemes are higher than 64QAM in thefirst CQI table, is equal to a spectrum efficiency in an entry that isassociated with a maximum CQI index and of all entries in whichmodulation schemes are 64QAM.
 11. The method according to claim 6,wherein determining the first MCS index according to the acquired firstCQI table, the acquired first MCS table, and the received first CQIindex comprises: determining a first TBS index and the first MCS indexaccording to an acquired first physical resource block (PRB) quantity,the acquired first CQI table, the acquired first MCS table, and thereceived first CQI index, wherein: the first PRB quantity is a PRBquantity allocated by a base station to the terminal device, or thefirst PRB quantity is a maximum integer less than or equal to a productof a PRB quantity allocated to the terminal device and a specificcoefficient; a first TBS table comprises at least one PRB quantitycorresponding to each TBS index and a transport block size correspondingto each PRB quantity, wherein the first TBS table is a TBS tablecorresponding to the first MCS table; and a value range of a TBS indexin the first TBS table is 0 to B, wherein B is a positive integergreater than or equal to 26; a TBS associated with a TBS index whosevalue range is 0 to 26 in the first TBS table is the same as a TBSassociated with a TBS index whose value range is 0 to 26 in a second TBStable; a value range of a TBS index in the second TBS table is 0 to 26;and the second TBS table comprises at least one PRB quantity associatedwith each TBS index and a TBS associated with each PRB quantity.
 12. Themethod according to claim 7, wherein determining the first TBS indexaccording to the first CQI table, the first PRB quantity, the first TBStable, and the received first CQI index comprises: determining,according to the first CQI table and the received first CQI index, afirst modulation scheme and a first spectrum efficiency that areassociated with the received first CQI index; learning, according to thefirst PRB quantity and the first spectrum efficiency, a first TBStransmitted to the terminal device; and obtaining, according to thefirst TBS table, the first TBS index that is associated with the firstTBS and the first PRB quantity in the first TBS table.
 13. The methodaccording to claim 6, wherein the multiple entries in which themodulation schemes are QPSK in the first MCS table, are multiple entriesin the second MCS table and in which modulation schemes are QPSK,wherein MCS indices associated with the multiple entries are at equalintervals.
 14. The method according to claim 6, wherein the first MCStable further comprises: multiple entries in the second MCS table and inwhich modulation schemes are 64QAM.
 15. The method according to claim14, wherein the multiple entries in the second MCS table and in whichthe modulation schemes are 64QAM further comprise: at least one entry,except an entry with a minimum MCS index, of all entries in whichmodulation schemes are 64QAM in the second MCS table.
 16. A notificationapparatus for a channel quality indicator (CQI), the apparatuscomprising: a memory configured to store processor-executableinstructions; a processor coupled to the memory and to a transmitter,the processor executing the processor-executable instructions to acquirea first CQI table, and acquire a first CQI index according to the firstCQI table; and the transmitter, configured to cooperate with theprocessor to send the first CQI index acquired by the processor to abase station; wherein the first CQI table comprises: (a) multipleentries in which modulation schemes are higher than 64 quadratureamplitude modulation (QAM); (b) multiple entries in a second CQI tableand in which modulation schemes are quadrature phase shift keying(QPSK); and (c) all entries in the second CQI table and in whichmodulation schemes are 16QAM; wherein the second CQI table comprises 6entries in which the modulation schemes are QPSK, the 6 entries areassociated with CQI indices 1-6 respectively, and wherein entriesassociated with CQI indices 3, 4, 5, and 6 in the second CQI table areentries in which code rates are highest in the 6 entries; and wherein, acombination formed by the multiple entries in which the modulationschemes are QPSK in the first CQI table, is neither a combination of theentries associated with CQI indices 4, 5, and 6 in the second table, nora combination of the entries associated with CQI indices 3, 4, 5 and 6in the second CQI table; wherein a spectrum efficiency in an entry thatis associated with a minimum CQI index and of the entries in which themodulation schemes are higher than 64QAM in the first CQI table, isequal to a spectrum efficiency in an entry that is associated with amaximum CQI index and of all entries in which modulation schemes are64QAM in the second CQI table; wherein modulation schemes in entries inthe second CQI table comprise only QPSK, 16QAM, and 64QAM, and a valuerange of a CQI index in the first CQI table is the same as a value rangeof a CQI index in the second CQI table.
 17. The apparatus according toclaim 16, wherein the multiple entries in which the modulation schemesare QPSK in the first CQI table, are multiple entries in the second CQItable and in which modulation schemes are QPSK, wherein CQI indicesassociated with the multiple entries are at equal intervals.
 18. Theapparatus according to claim 16, wherein the first CQI table furthercomprises: multiple entries in the second CQI table and in whichmodulation schemes are 64QAM.
 19. The apparatus according to claim 18,wherein the multiple entries in the first CQI table and in which themodulation schemes are 64QAM acquired by the processor comprise: atleast one entry, except an entry associated with a maximum CQI index, ofall entries in which modulation schemes are 64QAM in the second CQItable.
 20. A notification apparatus for a modulation and coding scheme(MCS), the apparatus comprising: a memory configured to storeprocessor-executable instructions; a receiver, configured to cooperatewith a processor to receive a first channel quality indicator (CQI)index sent by a terminal device, wherein the first CQI index isdetermined by the terminal device according to the first CQI table; theprocessor, coupled to the memory and to the receiver and a transmitter,the processor executing the processor-executable instructions todetermine a first MCS index according to the first CQI table, a firstMCS table, and the first CQI index; and the transmitter, configured tocooperate with the processor to send the first MCS index to the terminaldevice; wherein the first CQI table comprises: (a) multiple entries inwhich modulation schemes are higher than 64 quadrature amplitudemodulation (QAM), (b) multiple entries in a second CQI table and inwhich a modulation schemes are quadrature phase shift keying (QPSK), and(c) all entries in the second MCS table and in which modulation schemesare 16QAM; wherein the second CQI table comprises 6 entries in which themodulation schemes are QPSK, the 6 entries are associated with CQIindices 1-6 respectively, and wherein entries associated with CQIindices 3, 4, 5, and 6 in the second CQI table are entries in which coderates are highest in the 6 entries; wherein, a combination formed by themultiple entries in which the modulation schemes are QPSK in the firsttable CQI table, is neither a combination of the entries associated withCQI indices 4, 5, and 6 in the second table, nor a combination of theentries associated with CQI indices 3, 4, 5 and 6 in the second CQItable; wherein a spectrum efficiency in an entry that is associated witha minimum CQI index and of the entries in which the modulation schemesare higher than 64QAM in the first CQI table, is equal to a spectrumefficiency in an entry that is associated with a maximum CQI index andof all entries in which modulation schemes are 64QAM in the second CQItable; wherein modulation schemes in the second CQI table comprise onlyQPSK, 16QAM, and 64QAM, and a value range of a CQI index in the firstCQI table is the same as a value range of a CQI index in the second CQItable; and wherein the first MCS table comprises: (i) multiple entriesin which modulation schemes are higher than 64QAM; (ii) multiple entriesin a second MCS table and in which a modulation schemes are QPSK, and(iii) multiple entries in the second MCS table and in which modulationschemes are 16QAM; wherein the second MCS table comprises 10 entries inwhich the modulation schemes are QPSK, the 10 entries associated withMCS indices 0-9 respectively, and wherein entries associated with MCSindices 4, 5, 6, 7, 8 and 9 in the second MCS table are entries in whichcode rates are highest in the 10 entries; wherein, a combination formedby the multiple entries in which modulation schemes are QPSK in thefirst MCS table, is not combination of the entries associated with MCSindices 5, 6, 7, 8 and 9 in the second MCS table; wherein a transportblock size (TBS) index in an entry that is associated with a minimum MCSindex and of all entries in which modulation schemes are higher than64QAM in the first MCS table, is the same as a TBS index in an entrywith a maximum MCS index of all the entries in which the modulationschemes are 64QAM in the second MCS table; wherein the entry in thefirst MCS table refers to one modulation scheme and one TBS index thatare associated with each MCS index in the first MCS table, and the entryin the second MCS table refers to one modulation scheme and one TBSindex that are associated with each MCS index in the second MCS table.21. The apparatus according to claim 20, wherein the multiple entries inwhich the modulation schemes are QPSK in the first CQI table, aremultiple entries in the second CQI table and in which modulation schemesare QPSK, wherein CQI indices associated with the multiple entries areat equal intervals.
 22. The apparatus according to claim 20, wherein thefirst CQI table further comprises: multiple entries in the second CQItable and in which modulation schemes are 64QAM.
 23. The apparatusaccording to claim 22, wherein the multiple entries in the second CQItable and in which the modulation schemes are 64QAM comprise: multipleentries in the second CQI table, except an entry associated with amaximum CQI index, of all entries in which modulation schemes are 64QAM.24. The apparatus according to claim 20, wherein a spectrum efficiencyin the second CQI table and in an entry that is associated with aminimum CQI index and of the entries in which the modulation schemes arehigher than 64QAM in the first CQI table is equal to a spectrumefficiency in an entry that is associated with a maximum CQI index andof all entries in which modulation schemes are 64QAM.
 25. The apparatusaccording to claim 20, wherein the processor is further configured to:determine a first TBS index and the first MCS index according to anacquired first PRB quantity, the first CQI table, the first MCS table,and the first CQI index, wherein: the first PRB quantity is a PRBquantity allocated by a base station to the terminal device, or thefirst PRB quantity is a maximum integer less than or equal to a productof a PRB quantity allocated to the terminal device and a specificcoefficient; a first TBS table comprises at least one PRB quantityassociated with each TBS index and a transport block size associatedwith each PRB quantity, wherein the first TBS table is a TBS tableassociated with the first MCS table; and a value range of a TBS index inthe first TBS table is 0 to A, wherein A is a positive integer less thanor equal to 26, or a value range of a TBS index in the first TBS tableis 0 to B, wherein B is a positive integer greater than or equal to 26;a TBS associated with a TBS index whose value range is 0 to 26 in thefirst TBS table is the same as a TBS associated with a TBS index whosevalue range is 0 to 26 in a second TBS table; a value range of a TBSindex in the second TBS table is 0 to 26; and the second TBS tablecomprises at least one PRB quantity associated with each TBS index and aTBS associated with each PRB quantity.
 26. The apparatus according toclaim 25, wherein the processor further configured to: determine,according to the first CQI table and the first CQI index, a firstmodulation scheme and a first spectrum efficiency that are associatedwith the first CQI index; and obtain, according to the first TBS and thefirst PRB quantity according to the acquired first PRB quantity and thefirst spectrum efficiency, a first TBS transmitted to the terminaldevice; and obtain, according to the first TBS table, the first TBSindex the first TBS table.
 27. The apparatus according to claim 20,wherein the multiple entries in which the modulation schemes are QPSK inthe first MCS table, are multiple entries in the second MCS table and inwhich modulation schemes are QPSK, wherein MCS indices associated withthe multiple entries are at equal intervals.
 28. The apparatus accordingto claim 20, wherein the first MCS table further comprises: multipleentries in the second MCS table and in which modulation schemes are64QAM.
 29. The apparatus according to claim 28, wherein the multipleentries in the second MCS table and in which the modulation schemes are64QAM in the first MCS table comprise: at least one entry, except anentry with a minimum MCS index, of all entries in which modulationschemes are 64QAM in the second MCS table.
 30. A non-transitorycomputer-readable medium storing program codes executable by a terminaldevice, wherein when executed, the program codes cause the terminaldevice to implement operations including: acquiring a first channelquality indicator (CQI) index according to an acquired first CQI table;and sending the first CQI index to a base station; wherein the first CQItable comprises: (a) multiple entries in which modulation schemes arehigher than 64 quadrature amplitude modulation (QAM); (b) multipleentries in a second CQI table and in which modulation schemes arequadrature phase shift keying (QPSK); and (c) all entries in the secondCQI table and in which modulation schemes are 16QAM; wherein the secondCQI table comprises 6 entries in which the modulation schemes are QPSK,the 6 entries are associated with CQI indices 1-6 respectively, andwherein entries associated with CQI indices 3, 4, 5, and 6 in the secondCQI table are entries in which code rates are highest in the 6 entries;and wherein, a combination formed by the multiple entries in which themodulation schemes are QPSK in the first CQI table, is neither acombination of the entries associated with CQI indices 4, 5 and 6 in thesecond CQI table, nor a combination of the entries associated with CQIindices 3, 4, 5 and 6 in the second CQI table; wherein a spectrumefficiency in an entry that is associated with a minimum CQI index andof the entries in which the modulation schemes are higher than 64QAM inthe first CQI table, is equal to a spectrum efficiency in an entry thatis associated with a maximum CQI index and of all entries in whichmodulation schemes are 64QAM in the second CQI table; wherein modulationschemes in entries in the second CQI table comprise only QPSK, 16QAM,and 64QAM, and a value range of a CQI index in the first CQI table isthe same as a value range of a CQI index in the second CQI table.
 31. Anon-transitory computer readable medium storing program codes executableby a base station, wherein when executed, the program codes cause thebased station to implement operation including: receiving a firstchannel quality indicator (CQI) index sent by a terminal device, whereinthe first CQI index is determined by the terminal device according to anacquired first CQI table; determining a first modulation and codingscheme (MCS) index according to the first CQI table, a first MCS table,and the first CQI index; and sending the determined first MCS index tothe terminal device; wherein the first CQI table comprises: (a) multipleentries in which modulation schemes are higher than 64 quadratureamplitude modulation (QAM); (b) multiple entries in a second CQI tableand in which modulation schemes are quadrature phase shift keying(QPSK), and (c) all entries in the second CQI table and in whichmodulation schemes are 16QAM; wherein the second CQI table comprises 6entries in which the modulation schemes are QPSK, the 6 entries areassociated with CQI indices 1-6 respectively, and wherein entriesassociated with CQI indices 3, 4, 5, and 6 in the second CQI table areentries in which code rates are highest in the 6 entries; wherein, acombination formed by the multiple entries in which the modulationschemes are QPSK in the first CQI table, is neither a combination of theentries associated with CQI indices 4, 5, and 6 in the second table, nora combination of the entries associated with CQI indices 3, 4, 5 and 6in the second CQI table; wherein a spectrum efficiency in an entry thatis associated with a minimum CQI index and of the entries in which themodulation schemes are higher than 64QAM in the first CQI table, isequal to a spectrum efficiency in an entry that is associated with amaximum CQI index and of all entries in which modulation schemes are64QAM in the second CQI table; wherein modulation schemes in the secondCQI table comprise only QPSK, 16QAM, and 64QAM, and a value range of aCQI index in the first CQI table is the same as a value range of a CQIindex in the second CQI table; and wherein the first MCS tablecomprises: (i) multiple entries in which modulation schemes are higherthan 64QAM; (ii) multiple entries in a second MCS table and in which amodulation schemes are QPSK, and (iii) multiple entries in the secondMCS table and in which a modulation scheme is 16QAM; wherein the secondMCS table comprises 10 entries in which the modulation schemes are QPSK,the 10 entries are associated with MCS indices 0-9 respectively, andwherein entries associated with MCS indices 4, 5, 6, 7, 8 and 9 in thesecond MCS table are entries in which code rates are highest in the 10entries; wherein, a combination formed by the multiple entries in whichthe modulation schemes are QPSK in the first MCS table, is not acombination of the entries associated with MCS indices 5, 6, 7, 8 and 9in the second MCS table; wherein a transport block size (TBS) index inan entry that is associated with a minimum MCS index and of all entriesin which modulation schemes are higher than 64QAM in the first MCStable, is the same as a TBS index in an entry with a maximum MCS indexof all the entries in which the modulation schemes are 64QAM in thesecond MCS table; wherein the entry in the first MCS table refers to onemodulation scheme and one TBS index that are associated with each MCSindex in the first MCS table, and the entry in the second MCS tablerefers to one modulation scheme and one TBS index that are associatedwith each MCS index in the second MCS table.